BAD SERVICE, REQUEST OF CONTRACT CANCELLATION....

I've had the worst service at Telkom. First they said Telkom had coverage at Vanderbijlpark and I accepted a contract with them. When I received the rooter , it had no signal. After weeks of calling Telkom, I decided to take the rooter back to the closest telkom store. I received bad service from the consultants at the vaal mall store. She was rude and wouldn't listen to my reasons for bringing the rooter to the store. After minutes of pleading with her she took the device and since than Telkom has not contacted me and yet it's still billing me. I've been calling the customer service number and I'm being passed on from one consultant to the next. Please help.... this is Totally wrong.... this is bad bad survice