Cell C, no longer for me or my family

For three months my account were in arears and for three months I phone cell c customer to make arrangements. because of cell c poor services my account stayed in arears untill this month. Now my account is back on track but I can't get a new contract or up date my contracts because my account were in arears but since April I phoned customer care so that they can do a debit order on my latest acc and the one in arears but for three months cell c only take the bill that were in arears and not my latest bill as well. So the fault is with cell c. My account could have been fully paid already in May 2015. A few weeks ago I phoned the customer care and a lady spoke with me. When I asked the lady if she can assist me then she told me that I must give her my ID number first otherwise she cant assist me and then she hang up. Today I phoned customer care again and I first give the guy my ID number but I only started with the 79 then he said to me that he cant help me if I dont tell him how he can assist me. I told him what happened last time then he said to me he's not the lady for the other day they are working differently. Cell C must teach they staff how to work with the public