Bad service that cost me money

I called cell c about ten times trying to resolve an issue I have with them. I was told to contact the legal team which said they can't help me. Cell c keeps throwing me around from one department to the next without any help. I have a 100% clean payment record with cell c but it reflects on transunion records that I am still paying cell c which I am not.

All I want is for cell c to remove the amount they say I am still paying from my credit record.

My account was never handed over instate I paid it off before the contract expires. This is not how you treat customers,

Can someone help resolve this as it's costing me money to call and be on hold for 20minutes or more.

Porting my number to another network because of this bad experience with the network.