Cell c contract complaint

I have been calling cell c customer care and sending emails regarding a contract I took with them where they stopped debiting on their own and 2minths in when I check my credit report I am in arrears and this affected my credit score. Their consultant couldn't explain how the debit order was stopped because my 2nd contract that I have with them still debits as per contract agreement. I was told I need to pay the 3 months they didn't debit in cash and I don't have that sort of money to pay at a go. This was not my fault and I need my profile updated as it's affecting me badly