MBD Irritation

Actually I can't rate MBD as they fall FAR short of any rating. I paid my Absa credit card in December 2021 in full. MBD has been constantly harassing me for payment since then. Their operators are extremely rude and when I ask to speak to a supervisor, they give me a **** e-mail address. One of their operators said he can see my payment on their system and would look into it for me - to no avail. I logged a complaint on Hello Peter earlier this year and MDB contacted me for the reference number or my ID number to resolve this matter - I sent it to them immediately. A week later I got a very snotty reply on my Hello Peter complaint saying I had not comp**** with their request and they consider the complaint closed. 1 Month went by with no calls and now suddenly they have started up again! Where can I go to get these people off my back??? They don't respond to any communication from clients and don't listen to anyone!!! They are the most irritating and persistent company I have ever come accross.