Poor customer service

To whom it may concern, I had an MTN account 8 years ago, and have tried constantly to contact mtn to try settle my account to no prevail, The mtn legal team has no direct line for communication and I have to go through customer services every time I try to call. now the debt has been prescribed, I have ever since requested a Prescribe Letter from MTN with no luck. No response to my requests from MTN SA. I would appreciate it if MTN can get in contact with me and forward me the Prescribe Letter as requested numerous of times