Insurance paid for credit card. Still phoning me

I had a credit card with Standard bank and got retrenched. My insurance paid the balance of my credit card, but some *********** clerk did not allocate the money to my account for app. 3 weeks. Interest was added after month end and now still after 2 years I still get calls from some or other credit agency on a daily basis. First they want your ID number and bla bla bla. After 10 minutes of explaining they say they will investigate and get back to you. 2 days later the same thing happens and they argue till you get upset and say things you wouldn't normally say. After a while it goes quiet for a month. You will then receive a call from a different company with the same story. I received 2 calls today from the same company for the same thing. By now twice the amount has been spend on calls to me, than what the outstanding amount is. Will somebody with authority from Standard bank please call me so we can sort this thing out.