Cell C taking advantage of customers

Cell C had debited my account late due to their own incompetence. That has affected my credit score. This has only come to my notice because I now use clear score app. I can only imagine how many others are being affected negatively and can't get loans or credit when they need it, due to Cell C being at fault. They also wrongfully debit customers and then after WE scrutinize the bill and correct them they credit our Cell C account and not our bank account, from which the money was taken. We as customers are left to pay the extra bank charges on that month and more so if that billing was incorrect and we as customers didn't cater for "Unknown" bills. Then they say we are behind on our account and we as customers have to pay the failed debit bank charges which we not necessary in the first place.