I must make a simple service contracting program with service evaluation completed and deal with fraud in this hiring. Fraud in this case would be a server that would create multiple profiles that hire it and give ratings to increase its reputation on the site without it actually doing the job, and this includes a text field where it will have a description of the attendance and a note field. So my question is how can I deal with fraud in a simple way in this kind of program?
It would be nice if you have an unsupervised one for this as you do not need training and test data. The system will take into account information of who hired whom, how many service contracts a server has not completed and the time that the contract was started and when finished