Hathway — Account Termination

I have asked Hathway to terminate my account multiple times over the last year.
I have moved to a different city and I don't want their services.
I have paid the device lost charges and lending due.
Total Amount: Rs. 2500/-
They called me the next day to verify it and I said yes terminate the account.
After a week they are asking again to show proof of payment.
I gave them Hathway account id and transaction id of the payment.
Are Hathway that stupid that they can't open my account id in their system and see the payment has been made?

Account:[protected]

If you are good enough company open my account and see if the transaction are made.

Terminate my account i dont want your services.