Cell C unauthorized debit order

I have been trying for 3 months to cancel a router application and you have constantly been debiting my account for something that I never even received. What is worse is that u are even debiting the amount which is way higher than what the router was. I went to your store in Centurion on Friday the 5th of July and they gave a phone to call your customer service, I spoke to Siyanda Mpongose who assured me that the application was now canceled & also admitted that the mistake was on your side. He gave me the cancelation case nr *** but to my surprise you again debited my account today.Can someone just resolve this please.