Bank Of Baroda — Why my note stuck in cdm machine?

Address:

Pali, Rjasthan pin= 306401

Today i tryed depositing 2500 into the cdm machine and i received a receipt that 1 note is retained by bank and rest of the 2000 is deposited. my 1 note is not came back from the cdm machine, i told the branch manager and lodge a complaint they told it is a fake note...so u will not get...so please look into this matter immediately...i want my 500 rs back.. if it is fake than what can i do ??.. i didn't know .that its fake