Billing Dispute

I have two contracts with Cell C and have made a request in April that debit orders to my banking account be cancelled. I received a confirmation email with a reference number stating that my query will be dealt within 48hours. Up until the 7th of this month my request was not carried out. I have in the interim been billed R70 on each of my contracts for defaulting payment when yet I have made the stipulated contract payment amounts to Cell C's account at Nedbank since April. My lines are being constantly suspended and my account has now been handed over to the Intermediate department for action to be instituted against me for the recovery of arrears. Furthermore, because of debit orders being pushed through my bank account I am liable to pay the bank R1500 as well. I have had to deal with very rude, arrogant andf abrupt call takers, who has told me it is mandatory for payment to come off a bank account and that I will be billed every month with an additional R70 on each of my contracts. I have continuosly been sending the requested emails to various people at Cell C and to date have been pushed from pillar to post. I need this matter resolved asap