MTN trying to ****** me

If I could this company no star I could. I have been asking mtn to close my account since 2020 when I made my last payment to them. I opened a contract in 2018, received no statements, called to ask them and they wouldnt. They then handed me over and when I found out, I made a payment to the debtors, asked for a paid up letter and then sent it to mtn. I went in store to request it to be closed, it wasnt, I called the call centre multiple times over the years and still they refused to close it. I disputed it because on my credit report it shows that I am I arrears. Ive tweeted about it, posted on Facebook about it, spoke to them on messager and Twitter DM, they still wont close my account. I have not used this account since 2019 and now I dont know what to do. I am afraid if I give in and pay again, they will keep ******ing me. If anyone has had this experience with these ********* in a similar case, please let me know because I dont know what to do anymore.