First they cannot get my debit order correct

First they cannot get my debit order correct. It's taken months. Finally I get them to cancel my debit order so that I may pay cash myself. Now they easy pay number they provide does not work. I phone customer care, took 45min to get through. Then the representative can't hear me... Can't call me back and then says my security information is wrong!!! What the hell Cell C?! Another year and then never ****ing again will I or a friend, family member ever use this company