HDFC Bank — credit card closure

I was asked to pay 9000 so the remaining outstanding shall be settled in emi but then after paying the customer care says no such options. I kept paying the collection agent around rs. 4000 for 4 months and still my outstanding keeps increasing. I want to settle my outstanding balance in emi. I don't want to pay any amount to an agent. My card is lost n it is in blocked status n even then i am trying to settle it down. The customer care couldn't help as the card is blocked n the collection agents force me to do a ots which is not possible for me.