Openserve cannot solve my ADSL speed issue, again.

A few months ago I had a continuous problem with slow internet connection where my ADSL link will start at 4 meg and every day drop until it was below 2 meg. This was eventually solved by Telkom (Openserve). Three weeks ago I started having the same problem and now they are unable to resolve this! Who can I contact to assist me again? The online fault reporting does not work. I explained the problem to the technician that phoned me, but I received the "dumb" reply, "huh" and that was the last time I heard from him. What a frustration. PLEASE SOMEBODY HELP!