When did you notice the drop in rate? If they still don't update that in their site after a day or two of the change then they are already misleading. Another red flag.

If they refuse to communicate then I guess your only choice is to leave and take your invites with you. What they did tells people that they are on a tight budget and kinda gives the feeling that there's a chance a gambler may not get paid immediately if he happens to win big.