Terrible service

Terrible customer service My fiance took out a cellphone contract with Cell C which was paid off last year, there were some issues with the reference number which according to them has been fixed, but today we are still seeing that the contract is in arrears and is now reflecting badly on his credit record. He has been calling them and everytime he calls they say that the issue has been sorted but it still has not been sorted, this is really terrible customer service, struggling to get one simple thing done for months