You have had the same issue I have had, which I've now discovered occurs countrywide. Telkom denies there's a problem.
This is what I have found out by using my contacts and by cornering Telkom technicians.
Telkom, in their infinite wisdom, are replacing the ADSL core equipment... and they don't know what they are doing. They took out the entire Fourways (FWS) exchange for like a week.. They took out my exchange for four days... for 4 days had no ADSL at all, not even carrier.