public function assignData ($ data) is not called

In a payment module I am testing, I use the payment.phtl class that extends from Mage_Payment_Model_Method_Abstract and, for testing purposes, I put an output to a log file in two functions, public function assignData($data) and public function validate() , both in my class and in the original Magento class and I checked in the log that the original assignData($data) function was called and in my class not, although the validate() function is called in both classes. Thanks for any help.

This function of this class is not called

class Oitoo_Cielo_Model_Payment extends Mage_Payment_Model_Method_Abstract
{

    /**=====================================
     * Assign data to info model instance
     *
     * @param   mixed $data
     * @return  Mage_Payment_Model_Info
     ======================================*/
    public function assignData($data)
    {
Mage::log(' 88 =>  assignData  ' ,  null, 'cielo.log'); 
        if (!($data instanceof Varien_Object)) {
            $data = new Varien_Object($data);
        }
        $info = $this->getInfoInstance();
        //zera os juros para evitar erros
        $info->getQuote()->setJuros(0.0);
        $info->getQuote()->setBaseJuros(0.0);
        $info->getQuote()->getShippingAddress()->setJuros(0.0);
        $info->getQuote()->getShippingAddress()->setBaseJuros(0.0);
        $info->getQuote()->setTotalsCollectedFlag(false)->collectTotals();

        //zera o valor do desconto para evitar erros
        $info->getQuote()->setDesconto(0.0);
        $info->getQuote()->setBaseDesconto(0.0);
        $info->getQuote()->getShippingAddress()->setDesconto(0.0);
        $info->getQuote()->getShippingAddress()->setBaseDesconto(0.0);
        $info->getQuote()->setTotalsCollectedFlag(false)->collectTotals();


        $info->setCcType($data->getBandeiraCielo())
            ->setAdditionalData($data->getParcelasCielo())
            ->setCcOwner($data->getPortadorCielo())
            ->setCcLast4(substr($data->getNumeroCartaoCielo(), -4))
            //->setCcNumber($data->getCcNumber())
            //->setCcCid($data->getCcCid())
            ->setCcExpMonth($data->getExpiracaoMesCielo())
            ->setCcExpYear($data->getExpiracaoAnoCielo())
            ->setCcCid($info->encrypt($data->getCodigoSegurancaCielo())) //criptografa o código de segurança do cartão
            ->setCcNumber($info->encrypt(str_replace(' ', '',$data->getNumeroCartaoCielo()))) //criptografa o numero do cartão
        ;

        $parcela        =   $data->getParcelasCielo();
        $valorTotal     =   $info->getQuote()->getGrandTotal();
       // $valorDesconto  =   Mage::helper('apelidocielo')->getDiscountAmount($parcela,$valorTotal);
       /* if($valorDesconto > 0):
               // Mage::helper('apelidocielo')->setDiscountQuote($info,$valorDesconto);
        endif;*/

        //verifica se tem juros e aplica no carrinho. Se o retorno do getJurosAmount for maior que 0, aplica no quote.
        $valorJuros    =    Mage::helper('apelidocielo')->getJurosAmount($parcela,$valorTotal);
        $valorDesconto =    -(Mage::helper('apelidocielo')->getDiscountAmount($parcela,$valorTotal));


        if($valorJuros > 0):
            $info->getQuote()->setJuros($valorJuros);
            $info->getQuote()->setBaseJuros($valorJuros);
            $info->getQuote()->getShippingAddress()->setJuros($valorJuros);
            $info->getQuote()->getShippingAddress()->setBaseJuros($valorJuros);
            $info->getQuote()->setTotalsCollectedFlag(false)->collectTotals();

        else:
            $info->getQuote()->setJuros(0.0);
            $info->getQuote()->setBaseJuros(0.0);
            $info->getQuote()->getShippingAddress()->setJuros(0.0);
            $info->getQuote()->getShippingAddress()->setBaseJuros(0.0);
            $info->getQuote()->setTotalsCollectedFlag(false)->collectTotals();

        endif;



        if($valorDesconto < 0):
            $info->getQuote()->setDesconto($valorDesconto);
            $info->getQuote()->setBaseDesconto($valorDesconto);
            $info->getQuote()->getShippingAddress()->setDesconto($valorDesconto);
            $info->getQuote()->getShippingAddress()->setBaseDesconto($valorDesconto);
            $info->getQuote()->setTotalsCollectedFlag(false)->collectTotals();

        else:
            $info->getQuote()->setDesconto(0.0);
            $info->getQuote()->setBaseDesconto(0.0);
            $info->getQuote()->getShippingAddress()->setDesconto(0.0);
            $info->getQuote()->getShippingAddress()->setBaseDesconto(0.0);
            $info->getQuote()->setTotalsCollectedFlag(false)->collectTotals();

        endif;


        $info->getQuote()->save();

        return $this;
    }

This function is called but as it did not happen at first the data is not recovered.

 public function validate() {

        $info     = $this->getInfoInstance();
        $ccNumber = Mage::helper('core')->decrypt($info->getCcNumber());
        $bandeira = $info->getCcType();
        $validado = false;

Mage::log('178 =>  Bandeira  ' . $bandeira. ' ccnumber ' . $ccNumber ,  null, 'cielo.log');

        if (Mage::helper('apelidocielo')->validateCcNum($ccNumber))
        {
            $ccTypeRegExp = '/^4[0-9]{12}([0-9]{3})?$/'; //visa
            if (preg_match($ccTypeRegExp, $ccNumber) && $bandeira == 'visa')
            {
                $validado = true;
            }

            $ccTypeRegExp = '/^5[1-5][0-9]{14}$/'; //mastercard
            if (preg_match($ccTypeRegExp, $ccNumber) && $bandeira == 'mastercard')
            {
                $validado = true;
            }

            $ccTypeRegExp = '/^3[47][0-9]{13}$/'; //amex
            if (preg_match($ccTypeRegExp, $ccNumber) && $bandeira == 'amex')
            {
                $validado = true;
            }

            $ccTypeRegExp = '/^6011[0-9]{12}$/'; //discover
            if (preg_match($ccTypeRegExp, $ccNumber) && $bandeira == 'discover')
            {
                $validado = true;
            }

            $ccTypeRegExp = '/^(3[0-9]{15}|(2131|1800)[0-9]{11})$/'; //jcb
            if (preg_match($ccTypeRegExp, $ccNumber) && $bandeira == 'jcb')
            {
                $validado = true;
            }

            $ccTypeRegExp = '/^3[0,6,8]\d{12}$/'; //diners
            if (preg_match($ccTypeRegExp, $ccNumber) && $bandeira == 'diners')
            {
                $validado = true;
            }

            if ($bandeira == 'elo' || $bandeira == 'aura')
            {
                $validado = true;
            }
        } else {
            Mage::throwException(Mage::helper('payment')->__('O número do cartão digitado não é válido.'));
        }

        if(!$validado):
            Mage::throwException(Mage::helper('payment')->__('O número do cartão de crédito não é válido para bandeira selecionada: ' . $bandeira));
        endif;

        return $this;
    }
}