Beware of telkom

I had taken out a contract at the 8ta store in Pavillion in Dec 2013. It was a data deal. Tried using it but the reception was very bad and could hardly use it. Then i found out that there is no coverage in my area and when I took out the contract I asked the sales person and he said there is coverage. When I contacted the customer service center , they sent out a techician to come out to my place and he found that there was no coverage in my area. So he sent the report to them and I called them again and made arrangements for them to cancel the contract. They cancelled the contract only in December 2014 after about 4 months of going back and forth with them. Now I recieved an invoice for R1700.00 saying that i need to pay this because of early cancellation. I would like someone with some kind of authority in telkom to call me urgently as this is now frustrating. Firstly they sell me a contract that they are not supposed to and I had to pay a full years subcription for nothing as I could not use the data at home. I await a response from someone who knows what they are doing asap or I will be handing this matter over to my lawyer and also will be contacting the National consumer act