Line hasnt been functioning for more than 2 months

I moved my telephone line from one residence to another in the same town. Telkom activated my line with ADSL at the end of November, since then my line has been more down than up, and the times that it is up, it doesn't even test close to 1mbps instead of the 4mbps like I ordered. For January my line was only operating for 4 or 5 days in total again at less than 1mbps, then I get an SMS to say I have a bill of R1246.96! I made a payment of R600 during January to make sure that my line doesn't get cut because of me not paying. I spent hundreds of rands in airtime phoning Telkom from my cell to try and sort out the issue, I wrote on their wall on Facebook, I have sent numerous direct messages but my line is STILL down. I need assistance!!! I do after hours standby support from home, but because of my line being down I need to drive to the office for every call.