Accounts department giving false information!!!!!!!!!!!!!!!!!!!!!!

I have 4 numbers with Cell C. I only ever receive accounts for 3 numbers but make sure that there is more than enough available to pay all 4. Last month I was short on the one and it was suspended!! My fault. Because of this, I called Customer Care at the beginning of this month to make sure that ALL the accounts had been paid for May. I was told YES!!!! Nothing outstanding!! I have now received a message to say that the one line will be suspended due to non payment!!!! I have spent 20 minutes on the phone with customer care who cant believe that I was told everything had been paid for May because there is money due on the one number!! I am livid!!!!!!!!!!!!!!!!! If I was told the first week of May when I called that there is money outstanding I would have paid it then!! Now I get told in the middle of the month that I must pay R 1080.00 to avoid suspension??????? I have been with Cell C since the beginning - going on 20 years. I am really thinking of moving when my contracts expire!!!!!!!!! This is B$%#@% !!!!!!!