Being billed for a service that is not working!!

We recently moved into a new place..since then which is about 4months we have had little to zero adsl and we are unable to make or receive phone calls. Our bill per month 760, times that by four and yes you get the idea. We will no longer pay for a service that we dont have. This was first logged in January and either we hear nothing or no one knows what is going on or we get false promises. I want our faulty line replaced this week and a refund for all monies paid to telkom. You cannot be charged for a service that is not working most of the time. Its a *******. Im pretty sure im wasting my time doing rhis but im giving you the benefit telkom!!!