Severe Latency

Hi All, I am hoping someone can help here. I am experiencing massive latency spikes ingame. I normally have ~300-500 ping in game (I live in Australia so its a distance thing) but over the last few days (since 8th or 9th of October) I am getting common latency at 1500 and spiking well over 25000 and even disconnecting me due to latency. I have tried removing addons, dropping vid quality, changed IPv4 settings, cleared WTF and Cache, removed Patch-w.mpq as well as patch-enUS-w.mpq (the last one was recommended by GM ingame). nothing seems to be helping. the removal of the patches helped for 2 minutes but as soon as I got to a boss it went back to peaking.

I NEED HELP!!! the only thing that has changed since then is I purchased some gear through the store and added 2 addons. after removal of the addons and eventually a completely fresh download of the game, no luck.