High Latency, Slow Speed, High Jitter

For almost a month now I have had issues with my ADSL line. Line sync is fine, attenuation and snr is fine. But a pingplot for my line over 4 minutes shows an average second hop of 391ms with a jitter of 135.54 . In other words between my exchange and my modem I have almost double the ping I should have to europe and back twice. This is a blatant telkom issue occurring irrespective of which ISP account I make use of. Frequently I have 10% packet loss. This tends to occur during peak hours. The exchange seems entirely saturated and overburdened and there is 0 interest in correcting the problem because Telkom is only interested if it involves getting money. How can you possibly provide a line with such a pathetic quality. It is advertised as an always on best effort service and from what I see it is a sometimes on no effort service.