Just as an update, the Twitter route seems to have worked. It took about a week, but once the correct support department got the information they switched the line over to VDSL. So now the modulation is making use of VDSL instead of ADSL2+.
In terms of speed, seems that I never updated the...
We recently upgraded our 10mbps ADSL line to a 20mbps VDSL line. My router indicates that it is syncing at 20mbps, and our uncapped account is fast enough, but I am only getting 13mbps download speed. It seems that Telkom did not change the line from ADSL to VDSL and it is syncing using ADSL2+...