Is it that they are targeting you or are they hunting as a group in general? I"m sure there are controls on most poker sites that show when particular players play on the same table more often than normal so support should be able to back up your theory or not.
More as a group in general. I have noticed if I put in a raise, 2 if not 3 of them will call, I bet on the flop...call, call. Bet the turn, 1 will raise the next one reraises etc and they basically bet me off the pot so even if I have say KK I cant call on a J985 flop for example. All quite normal for a 6max table if it wasnt for them all being from the same country, Sweden is an hour ahead of us as well which makes it even later for them.
Another thing is that they always play bad beat tables. If I recall correctly there has to be 4 players in the pot at the start of the hand (might be wrong there) which is a valid reason for half the table to call any raise.
The problem is that around 3-4am there are not that many players playing cash and a lot of them are regulars so if they were to ban the people playing the same tables regularly there would be no one left
It is actually the perfect spot for a group to work and will be tough to spot I think.
On the plus side if you hit a flop hard you get paid off big time
I havent been able to report it yet as the support email link on the site wont let me do it as I dont have their default mail client installed :/