Nightmare Billing

I have had many sleepless nights because of Cell C and their incorrect billing of my account apparently I have subscribed to some content service I have called them to cancel this service and I was told to dial a number to unsubscribe from this service which I did between April and May to my suprise it is October now and I am still being billed a extra R50 every month I called them to complain about this and was told they can’t assist me since wasp content services are subscribed to by me as a customer I explained many times that I have dialed the number to cancel yet every month the content service is still on my invoice I was told to call waspa and send them emails which I have done what is surprising is that the number in question is a data sim that’s always in a router now how I was able to subscribe to content services still baffles me even now can I be assisted to sort this mess out