Over Billing/ Non cancellation of sim cards when they supposed to be cancelled

I cancelled my contracts over and I'm still being charged for them. when i had these my bill was around R800 to R900 but now instead of being billed less than R200, i am being billed around R1264 and R1400 and was told that the cancelled sim cards are not cancelled and i went to the branch in Rosebank and Southgate to cancel these and signed documents and received confirmation sms's. the last 2 sim cards were cancelled now in February of which i was told they not cancelled because i have an outstanding amount. I called them in March and was told this issue will be settle it was not, I called in again now because it does not seem to be getting sorted, instead it is getting worse.

I am unhappy and disappointed at Telkom for this over billing me when i have been their loyal customer for years.

Dineo Thipe ***