Bad service

I had a cellphone contract with MTN in 2018 and I was supposed to pay it for 24 months but due to some challenges I couldn't continue paying at some point at a later stage ,my account was handed over to the attorneys and I settled with them and the same issue happened twice till I got to a point whereby I requested for the full outstanding amount for me to settle the account with MTN ,the amount was given to me and I paid more than the amount,they were the once owing me now ,but to my surprise till to date I'm still receiving statements from MTN stating that I'm still owing them ,they even listed me again and this have affected my credit score as well ,I tried calling them and they've been sending back and forth and the sad part is that each and every call I make ,it take 1 to 2 hours without any concrete solution,

Now I'm deciding to get proper lawyers who can assist me with this issue,I'm with clientele life and I've reported the issue to them yet they are also lenient with this issue .

MTN company they are really bad with their service