Yellow pages incorrect billing and lack of response or service.

I have repeatedly tried to make contact to sort out over 16000 worth of overcharges which i cancelled exactly how i was told to. The charges are billed through my Telkom account and when i questioned them my line was cut by Telkom for over a week because i refused to pay. i have emailed and called for 3 weeks now. the service from the yellow pages and the voice prompt is totally irrelevant and hangs up after it informs you no one is available at the office or at work to assist. I have been appalled by the service or lack there of from a company of the magnitude. They are very quick to debit but do not follow their swift payment method with backup service.