Bad service

I took out a contract for my daughter in Dec last year. Due to circumstances i had to change my account details and i informed Cell C way before the time, but every month they did not take the money for my account as this was a debit order. i had to do an eft payment every month and sent them the proof of payment every month, but still I'm told that I'm in arrears with R1100. every 2nd day my daughter receives a message that her phone will be suspended because of non payment and i call every time and the excuse is that they do see the proof of payment and that they are waiting for Cell C to send the statement of my account. i have spoken to numerous consultants and even the manager of the call center and was given the same story. i went into the clearwater branch and the lady told me that she will update the system because my branch code was incorrect and that it will take 2 weeks to update and that i must make the eft, but to my surprise this morning i was debited an amount of R2200 which of course i did not have that in my account and it bounced back and that is after i made the eft payment of R1098 which is what i have been doing every month. this is very frustration as i am now been told that i will be listed. I need for a manager to call me back and sort out this bad terrible service that i have been getting. it seems that no one in Cell C knows what they are doing. my contact number is *** and the contract number for my daughter is ***