Bajaj Finserv — company is charging me unnecessary interest charges and threatening/harassing if I won't pay them

Address:

16/3 1st Floor, Indira Vikas Colony, Delhi 110009, New Delhi, Delhi, 110009

I bought a product of 12500/- and EMI was 1260 PM. They started deducting EMI's from my OLD account which was closed 2-3 years back. I gave them information of my new account and there executive lost my documents. Since then, I was being called every month to the cash amount. I paid for first 3-4 months but then I stopped as I wanted to fix this issue due to my CIBIL being hit. I requested many times and then things heated up. There representatives, Managers and recovery agents were so damn rude however I stood still. I then started getting calls from police department and lawyers. I made it very clear that only 2 EMI's are left, first you remove the bounce back charges and then i will make the payment. No solution to that.

Imp note - I got a call some days ago, to pay 3000/- to wrap this one set for all whereas my actual amount due was 2520/-. I paid 3000/- as full time settlement to get the NOC but no NOC yet and company is denying that we made this kind of promise. Now they are asking me to 9825/- as the interest and bounce charges.

Please help as they are harassing and threatening by calling after every 1-2 days