Company deducting bond money when I have not signed any bond

Hello, After i left the company my full and final statement is issued by company with a Huge deduction of bond (Rs.150000) . I have not signed any Bond when i have joined the company ,i have communicated same to HR & asked for revised statement or to share bond Documents. To which HR replied " All (GET-Trainees) has to sign the bond with the company we have not able to find any document & "If someone have not followed the right practice in Mumbai at the time of your joining due to oversight than it does not mean the principal process get change. All GET joiners are liable to pay the service breach bond recovery." Issue is dated back November 2012 , i have not pursuit matters at that time as i thought i don't have enough resources to challenge Big corporation and i felt threatened but now its hampering my current Job opportunity. All New Trainee used to Sign Bond (As HR replied) but during my batch 19 peoples has not signed bond as we have joined at different location.