Shocking line quality from Telkom ADSL in Ocean View and still not fixed after 5 weeks

We installed a Telkom ADSL business line in Ocean View, Cape Town at Ocean View high school at the end of last year and the quality of this line has been awful over the past 5 weeks. We had no response to a helpdesk request on the web. After phoning Telkom - a technician eventually came out 2 weeks ago. He said there was a problem with the line but has been unable to fix it. It has been going down and up continuously. This line is a critical to the running of a cooperative operating in Ocean View and they have not been able to carry out their business activities because of this ongoing problem.