Cell C ********** Upgrade and subsequent debit orders

A ********** upgrade was carried out on my prepaid data contract in August last year without my permission. I sent the documents in to Cell C, Watercrest Mall, along with the police affidavit. They forwarded these to the Cell C ***** department who has not got back to me yet. This was done on the 22nd December 2018. I had to reverse the debit orders and cancel them. I also instructed the staff at Cell C Watercrest to stop my contract immediately. Having done this, more debit orders with new reference numbers have come off my account and I have had to cancel and reverse these as well with my bank. Cell C cannot help me as they say the ***** investigation has to be carried out before they can take my details off the system. After phoning them for help, I was led on a wild goose chase from call centre department to call centre department and cut off and not given a reference number. They apparently couldn't or wouldn't help me and refused to give me a reference number for the call.... The whole thing stinks of a ******* syndicate operating out of your call centre and they have each other's backs... This is unacceptable and pathetic service. Due to your poor security and ******* call centres, my bank details have been hijacked and someone is running around with a brand new phone that is funded by me. What's worse is I cannot effectively cancel my debit orders without them creating new ones whenever they please. I need someone to get hold of me immediately to resolve this, someone with the authority to sort this out. I trusted you with my bank details but clearly you cannot keep them secure.