I've logged my extremely high attenuation for my exchange (BENMORE GARDENS (RBGS) Exchange) using the Telkom Fault-Logging page.
ADSL Link Downstream Upstream
Connection Speed 1024 kbps 512 kbps
Line Attenuation 57.5 db 31.5 db
Noise Margin 14.0 db 9.0 db
Hopefully a resolution. Could such attenuation be a result of congestion?