random in game laag and disconnects

I get random lag spikes and disconnects I have ping tests to co.za I get my standard constant 19ms ping rate when I ping www.warmane.com I get 2-4 which I know is horribly incorrect because your sites domain is further away than my countries general co.za domain( I think its a domain as well not sure) especially as my in game ping is 120-180 so I cannot use that as a reliable ping to the game directly. I have a 100mb/s line and I'm with Vumatel on a fiber optic connections. i have a ping test open at all times for stability tests and when I lag in game I do not have any ping drops or spikes on my normal line.

i am using the client downloaded from https://www.warmane.com/download wotlk version
i have added add-ons but I've removed all of them completely and the issue persists. i do not have this issue in any other online games so i can only assume its an issue with either the client or my connection to the server

any help would be greatly appreciated in sorting out this issue.
thanks in advance.