Telkom debiting even after my service has been suspended

Cancelled service in June 2018 exactly as instructed by Telkom store. My bank account is still being debited after repeated calls to Telkom to be refunded. I get given different excuses with every call and passed on from department to department. I'm at my wits end and not sure what else I must do to get my refund. Also unable to get hold of anyone in management in any of the departments and when I get 'put through' the call gets cut. How am I meant to get my refund if the call agents can't help me and I can't speak to someone in management. Even after confirmation from Telkom that refund is due. I've spent hours on this and am so frustrated. PLEASE HELP ME TELKOM . . .