Telkom and their ****ty service

So I took out a contract with yellow in September, I was given the wrong deal and was charged incorrectly. Fast forward to January 2019 and the issue is nowhere near resolved. I am calling Telkom literally every other day trying to get those resolved. They share sending the incorrect invoices and all I have been doing is asking for the correct bill so I can make payment. My line is suspended then unsuspected ever other month since then. The manager's at their Durban and Johhanesburg call centres are useless, I requested a call back nobody called me back. I am sitting with a declining credit score because of telkom because it seems like I am not paying my bills. I am not able to take out a phone contract because it shows I owe Telkom R1700 when I infact owe them R400. My line has been suspended since the middle of December yet i'm expected to pay a bill at the end of January. This has been extremely frustrating having to call to get this resolved. This has been an extremely ****ty experience.