Consumer Redressal

I joined for engineering in 2010 in management quote. i dropped out from engineering when my admission got cancelled because i failed for 3 years. According to VTU, i need to re-apply for new admission again because of failing for 3 years. since i find engineering hard to cope up with, i decided to dropout. But when i went to college to collect my certificate, college is not giving my certificate back. Please help me to get my certificates back, and is there any rule giving college management permission to hold certificates, if the student joined in management quote. regards