Forged signature on sanction letter

Hi This is with regards to our DHFL loan - 00009365 which was transferred to SBFC ltd -PR00911827 in June 2021 when Prem Kumar(SBFC Agent) and Vinay Yadav (SBFC agent) reached out to us saying DHFL is winding up hence our loan is being moved internally to SBFC ltd and in that purpose they want KYC documents. They Also offered us 1 EMI moratorium and 0.50 % interest rate deduction from the previous interest rate to seek our interest. Hence we provided the KYC documents and signed couple of Terms&conditions papers(not the sanction letter) As they said it is a takeover of loan from DHFL(winding company) there would not be any charges here(anyways if there were charges we would have not shifted the loan to SBFC). After these procedures ended and EMI started to get deducted from our account , we asked for the repayment schedule which Prem kumar & Vinay Yadav hesitated to give and after multiple follow up they sent the repayment schedule of the loan. As per the repayment schedule, the Principle amount was Rs.19,10,000(as of June 2021) however as per the DHFL repayment schedule the pending principle amount was Rs 18,90,951 (as of June 2021). When we asked about this discrepancy , Prem Kumar said this is how we got your portfolio from DHFL. Also the loan tenure pending at DHFL was 12 years which was extended to 14 years at SBFC without our knowledge. As these all information are written on the sanction letter, we were not given the sanction letter instead Prem kumar and Vinay yadav themselves signed the sanctioned letter (Forged Signature) which came to our noticed when we thought of making prepayment of some amount to lesser our interest burden and there was 3 % charges being levied on prepayment. Hence we asked for the sanction letter from customer care and saw a fake signature on the sanction letter. When we now ask about all these discrepancies, they do not have any answer nor they are replying on any of our mails. So we stopped the EMI from our Account however the collection people are following up on EMI with us on daily basis asking us to pay the regular EMI and look out for the actions. It is been 2 months now since we have reached out and we have not heard anything back. What can i do here?