Yes you can go to
http://www.kahnawake.com/gamingcommission/ and file a complaint for starters they (betus) are registered with them!. they will have two weeks to answer, but what ever you do, do not accept any checks from betus.com i can tell you from experience the checks are as good as betus.com is ?
betus affiliate website and the betus.net website which they also own, is down and been down for the second day! betus is a shady operation that will take the money and run or hide should i say! Good Luck