Terrible line speed for months

<p>I've been having terrible line speed for more than a month now. It works during off peak periods, but in the evenings it's unusable. A technician is dispatched to resolve the issue, and within an hour it reoccurs. It's now 20.30 and my line hasn't been working since 18.00. My latency is over 10 seconds. I've run a trace route, and all problems point back to the exchange. Predictably, the clueless call centre says nothing is wrong with the exchange. PLEASE RESOLVE THIS ISSUE. I'm paying R500 a month for no service. </p>