Bajaj Finserv — emi card permanently blocked.. please reactivate my card

Address:

Amravati, Maharashtra, 444604

I was unable to pay my 3 installment to bajaj finserv because of my serious issue and i clear all the amount with due and after 3 rd installment bounced and after that i was ready to pay all dues (Money) to them and i called them up and they created a full and final letter which they just reduced cheque bounce charges and told me to pay that amount and i paid all the f&f amount in the favor of bajaj finserv ltd.) what to do next?? Any solution?
My name on card is nikhil sunil tidke
And my contact no is [protected]
Plz resolve my issue...