1. What are the terms of the agreement? Once an agreement is made then both parties thereto have to perform their obligations under it.
2. On what basis could you conclude that the site is loaded with faka jobs and datas? Would you be able to prove this in the court? Ultimately, everything boils down to the agreement to ascertain whether the online job portal company has performed its contractual obligations or not.
3. If the company has not acted in pursuance of the agreement then you are within your right to stop the payment of remaining cheques. Any legal proceeding initiated by it can be fittingly contested by you.
4. Consult a lawyer with a copy of agreement.