bad service

I have am ADSL with telkom. Since installation of my new telkom modem in Dec 2015, we have has intermittent and very slow internet service. For the last week the service was virtually non-existent. We phone at least twice per day (10212) and gets told by consultant that they will synchronize the line from their side. We then check for signal whilst they are on the line, and it then works for about 15 mins and then goes off again. We have made several request for a technician to come and sort it out (last ref no: 348cwk140116). tO DATE NO-ONE HAS COME OUT AND WE REMAIN PAYING FOR INTERNET SERVICE THAT WE DO NOT HAVE ACCESS TO.<br> <br> THIS IS UNFAIR AND FRUSTRATING AS WE HAVE STUDENTS IN THE HOUSE WHO NEEDS TO BE CONNECTED FOR PROJECTS ETC.<br>