Done that for 2 months. They test during day it is fine, from 6 you have no download. What do you expect of telkom selling you something that does not work.
This test was done only with a cellphone on the line.
Ping: 698ms
Download: 0.01Mbps
Upload: 0Mbps
If you test with a different ISP account, do you get the same results? And if you ping your exchange, what are your pings sitting at?