Poor Adsl service

I live in Boston. Have a 4 meg line with uncapped ADSL service provider is Telkom. When doing online test, my line runs at 1,3meg only. This is daytime, nighttime, early morning, late afternoon YET IM BEING BILLED FOR A 4 MEG LINE. <br> <br> This evening my adsl stopped working. Was told to restart router, ports reset, factory setting reset, still no Internet. Now Telkom says line is faulty. How does this happen????? Internet worked till about 15:30 this afternoon then died on its own. <br> <br> PLEASE HELP TELKOM.. I'm terribly frustrated at this point in time.