CANCELLATION AND BILLING ERRORS

I have been battling to get my sim cancelled since last year. After numerous calls and tickets it is still not done. I have been contacting them and they keep referring to 1 ticket number, which just goes to show that there staff is ***********. I am still being billed monthly random amounts ranging from R30.90 to R479.00. The sim card does not work so I do not understand how I can be charged for a service that is not being provided, which goes against the CPA. Today my account was debited with R1060.00. I am trying to phone them to resolve this but the number does not go through.