Fault logged 4 times without fix

We have logged ADSL line faults (current fault ticket: 39CEZ220615) four times now. Every time a technician comes out, they confirm there is noise/problems on the line preventing us from getting 20Mb DSL and causing the line to go down. This internet connection is being used for a national business with our location being the HQ. <br> <br> Your technicians have told me it will be some effort to find the fault on the line from the exchange to our location and leave our premises to do it, yet they end up closing the ticket the next day without ever coming back.<br> <br> It is too much effort for your guys to fix the line. Pathetic service!!