Have you noticed...

This will probably explain it for you

http://mybroadband.co.za/news/ADSL/3934.html

Telkom has however indicated that the trial unveiled some backhaul constraints in their network, and that subscribers will only be upgraded to 512Kbps and not the 640Kbps associated with the trial.

They probably downgraded you to be in line with everyone else. You were added to the testing phase which was 640Kbps but the trial is over now so the official speed is 512Kbps
 
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