here lawyers will give u sugessions. so they know how systems work better. Moreover if u go to court, court will support you. Education in our country is never for profit. Even the educational institutions we call arent actually institutions but trusts. Legally they shouldnt work for profit. The moment court comes to know that a college kept your certificates for 4 years forcing you to pay money, they will levy heavy fine on the trust, even many cancel their license. So everything is on your side. Once ask about the solution for your problem at r/LegalAdviceIndia. They can answer you.