Netwrodk Speeds dropping from 18h00 onwards

I just quickly need to know, the network speeds for the past week has dropped like a rock on international from 18h00 onwards, is this like a regular thing with 8ta or are there some network issues, because if this is a regular event I'm canceling my contract on Monday which I just entered into this month, can't believe that where at 2013 and a company like 8ta AKA Telkom can't actually be proud of their speeds they provide ppl with, they should be ashamed.

Feedback on this from other users would be much appreciated.