ADSL line faulty since mid-December 2015

Since September 2015 we noticed a decline of speed on our 10mbps line which continued to decline until the line completely stopped working in December. We logged faults via our ISP (Afrihost), which were escalated to level 3 at least twice and multiple times to level 2.We also logged faults directly with Telkom. A technician came out the 1st 3 or 4 times we logged a fault, but since then Telkom simply closed the fault ticket without anyone coming out to fix the line. Every time the technician comes out, he fixes the problem, which still left us with less than 5mbps speed on our 10mbps line. 30-60 minutes after the technician leaves, the line went down again. This happened more than once. The line sometimes starts to work for a couple of hours and then dies again for a couple of days. We requested that a snr technician come out to properly fix the line or replace the faulty line, but to date, Telkom has not done anything. It's been almost 2 months already and we still have no working line. Telkom seem to not give a damn and refuse to deliver on the service we're paying for. Our area has no other internet connectivity options other than using cell data, which is too expensive