UPDATE on my situation: The general server connection is now usually at about 140ms which is still not good but quite the improvement.
I can also finally play the game ping wise at around 20-40ms.
HOWEVER whenever I join a server, a new round starts or I switch the squad I get extremely high ping that usually gets right up to the cap of 999ms.
This lasts for about a minute.
These laggs, although only occasionally, still pops up during the game without any of the listed events needing to take place.
I'm glad to be able to finally play the game.
But this is still not a state exceptable for a AAA game from such a well known company, especially so bc the customersupport doesn't seem to have any idea on how to fix it.
PLS FIX, bc I can't refund it (nor do I wish to).