Forcefully taken signature on empty promissory note

I had joined as a service advisor in a workshop nd they sent me for service advisor training after completing training they asked me to work in spare parts but I refused and I will resign so they told me to continue as Service Advisor nd did not handover me the spare parts section but after six months they had audit nd finds 2lakhs short nd asked me to pay the shortage amount but I said I am ready to fill police complaint because I did not agreed to work in spares but they forced me to sign on empty promissory note I refused to sign on that but they forced so I forcefully signed on it but now they asked me to submit all my original mark sheets otherwise case is filled on me so now I am waiting in dilama I don't know what to do plz suggest me sir