Disgusting Customer Service

Wanted a Contract, MTN didn't do what was necessary, sent the complaint through & after listening to the call, the case was deemed in my favour & the Contract was cancelled from Inception & any charges were reversed, this was September 2022. To date I am still receiving a statement & invoice for R335, every month I reply with all the information that this was cancelled. They have now put it on my credit profile as a default amount. Their Customer service is a joke, their legal department is just as bad. I am not surprised that people would rather go elsewhere as MTN has no customer service