Osmania University — Collecting additional exam fee than notification

P.V Ram Reddy college is under osmania university but collection high exam fee than notified by osmaina university there the exam fee is 3600 for mba sem 2 cbcs they collected 5700 and for sem 3 instead of 3500 which is notied by ou they are collecting 5100 when asked to they sre showing some demand notied which i confirmed with different colleges they have no idea what demand notice pvrr is collecting of. There are almost 300 students* 2000(additional fee collecting) = 6, 00, 000 additionally they are charges on student i have all the call recordings and fee receipts please help me