Inappropriate credit records

I had a credit card with Standard Bank, paid up in November 2015. I recently received an SMS and email threatening me with legal actions from STUPEL & BERMAN Inc attorneys for non payment. I rep**** on email that I don't owe anything and attached a settlement letter received last year to the attorneys and cc'd Standard Bank customer division. I haven't received any response but am getting smses daily. I cannot be harassed like this especially after experiencing identify theft involving a bank that didn't do a proper check on the applicant. Please help me.<br> <br> Regards