Services Disconnected, Incorrect Billing, and False Adverti*****t

I have no internet connection because Telkom has decided to cancel my service despite several calls I have logged with them telephonic and via Twitter/Facebook. I am now considering cancelling the contract and I refuse to incur any penalties because this is all Telkom's fault due to incorrect billing and inefficient and useless billing department. Over 9 calls all resolved or closed without any feedback being provided to me, and when I questioned how figures were arrived at, they are still busy with their investigation and yet it's three months later, and I have no internet. I have had it, and I want out!!! Thank you!!!