Fault closed without fixing problem.

Good day. I opened a ticket with webafrica on 4 march complaining of low upstream and downstream snr and unstable download speeds I was then given a fault number from webafrica (68BWK040315) and told a technician will visit my house to check out the problem. On the 7th of march a telkom technician arrived at my house and checked my router and found nothing at fault. He walked to the exchange which is less than a 100meters from my house and told me the problem lies with the exchange. He assured me the problem would be solved in the coming week. A week passed and nothing was solved and this morning i logged onto telkoms fault tracker and saw the fault was closed . I reset my router and the problem still persists. No comment was left on the fault and was simply closed. What Now ? As I am currently paying for a 10mbps line which completely slows down exactly at 8pm every night.