SBI credit card legal team threatening for payment even after settelment cleared

Hi, my name is wasiq.
I had dues outstanding, so asked for settlement of 30k in 2 months time.

I received a settlement letter as below;
1st installment 15k 31st jan 2017
2nd installment 15k 25th feb 2017

It shows only 25 days to pay both installments, i replied them to make 60 days.

However i requested Chennai team & payed my installments as below
10k 31st jan 2017
5k 2nd feb 2017
15k 30th march 2017

These payments has been done in coordination with sbi Chennai team, i also been told by them that payment is setteled & cleared, ill be receiving clearance letter soon.

But I didn’t receive any clearance letter till now.i only have few text messages & call recordings where they confessed my settlement cleared.

Now again im getting threatening calls from SBI Bangalore legal team for payment of 42k.

Please help me in this case.

Regards,
Wasiq