Afrihost Speed

We have been having generally terrible internet speeds on our ADSL internet connection. We have purchased a 8 mbps line with a capped 250 GB including line rental. My line speed is running at 1.5 mbps on a good day. I have logged 3 calls so far via their contact center as I am not home during the day and cannot phone the call center before it closes. First two times, I got told I'm not using the correct speed test app and I should use telkom - I was given usernames and passwords that didn't work which I complained about in a return email (this was ignored). After the 3rd call was logged, I was running my internet speed test on the correct app all along. I became hopeful as it seemed like this person tried something else besides palming a useless telkom username and password off on me. Of which I tried their suggestions and sent them my log of speed tests, which anyway just ended there with no further response. I beg! Please can I have either a credit for my really ******* line speed or if possible any type of useful service would be great?