Cell C lack of taking responsibility

I've had a contract with cell c for over 48 months now the service was great but recently they are giving me problems. 4 months ago a consultant mistakenly changed my debit order from month end to the 15th and cell c did not pick that up , but i did and took it upon myself to correct that error by paying manually even though my credit score was negatively affected. Second month it was the same until now. My credit profile shows me as a slow payer due to cell C's negligence. My problem is that in all these instances i had to take it upon myself to rectify cell c mistakes but they never even once took responsibility despite their empty promises that the debit order issue will be fixed, i lodged several service requests to have this fixed to no avail. Recently i picked up the same mistake still and paid them a R1000 through their application but as a sit here both my lines have been suspended. Cell C has never even once taken responsibility even though my credit profile has been negatively affected by their mistakes.

Regards AT Skosana