Terrible service

I took a phone contract and the account was eventually handed over, the company that’s dealing with collecting has the most terrible service I’ve ever experienced. I should be done paying the account but they are still charging me I’ve cancelled the direct debit and I am not willing to pay anything until everything is resolved. My credit profile was last updated in 2020 and it says that I owe about R1 000 which I believe I’ve paid but they still say I owe more than R8k I’ve sent millions email to them and they just told me that they will contact MTN and they never get back to me. I’ve also called MTN multiple times and the ladies at customer service just tell me to contact the legal team I’ve sent millions of emails to the legal team and the last time they rep**** they asked for my ID number and no one ever got back to me I’m tired I want this resolved. Do I still owe you if so how much and can my credit profile be updated as well. This is very frustrating to deal with especially because MTN is such big company to be providing such service