complete lack of service & lack of urgency

one of my references S3-8GS3O-OA6IS. i have been trying since September to cancel my ipad data contract with Vodacom, since taking over my contract from Nashua Mobile the service has been SHOCKING, after 30 phone calls i eventually get some help, i get a reference number and i can pay at vodacom shops anywhere or eft. i try eft. incorrect reference it states. i go from Vodacom shop to Vodacom shop for 2 months now i have tried to pay the last amount so i can cancel the contract and get Vodacom out of my life, every shop i go to doesnt accept account payments, eft doesnt work and since then ive sent message after message and called countless times and to date no response no call backs no human intervention at all. yet after being instructed not to touch my banking account, they dare to take money off my account, my explicit instructions are ignored and it is impossible to pay an account finished to get rid of Vodacom, so can someone please tell me how the heck to get hold of the CEO because the rest of the company couldnt be bothered.