Selling a service that doesn't work

I got my asdl connection last year Oct. It wasn't long and my problems started. Almost every week I had no connection and a fault was log. At last during April May and June I had almost no service at all and decided to cancel my connection-Ref nr ***. Telkom sold a service to me that doesn't work at all in my area. Although that they didn't tell me of course!. I paid the account I received in July and then I received another 1 this morning. I called the call centre and told my problem to the lady, she wanted the date when I cancelled and I wanted to give her my reference. She told me to hold on she want to get into the system-after half an hour she irritably told me she is still waiting for the reference(after telling me to hold on). I gave it to her. She said the cancellation wasn't done completely and I wanted the account sorted out. Was told to call the billing dept. I refused, Telkom made a mistake and should assist better than to give orders to the client. She connected me with billing at last and still my time is being wasted by non assistance. Mam you should be called in 10 days time. WHAT!! Nothing sorted out. WORSE DECISION OF MY LIFE TO CONNECT ASDL TELKOM