Biggest mistake. Now a nightmare

I have taken 2 contracts with cellc a debit order was set for the 26th. I still have not been debited i have been calling customer service day after day. I have received such pathetic service. They consult recently advised me that the agents had put in an incorrect branch code after days of calling i was told it has been corrected however to date i have still not been debited but i keep receiving messages that i am in arrears and now my credit profile gets affected because of these *********** people. They service is pathetic they are so useless. To cancel this contract i must pay R5000 for device to get rid of them. How the hell to i sort these damn people out. I have sent so many emails not a single manager has contacted me yet i requested to speak to one numerous time. This is such a nightmare.