HDFC Bank — auto loan issue

Hello HDFC,

I opted for car loan from you and have paid all most only 22k left which I stopped because one of your executive picked up a cash amount from me and didn't not update emi at your end and I started getting call from your collection agency, I did update them even I made a complain about cash pick but no action were taken from you, paying this small amount isn't a big deal but you are continually threatening me with misbehaviors collection calls. Just understand I have made n numbers of complaints about many issues but no response from your end.

I am looking for a proper response and resolution as I am tired getting calls from you and explaining the same issue to each caller