So the hashed SHA512 of the server seed is different from the hashed server seed they gave to me when I started my session. Isn't that considered cheating? I mean they probably are calculating right the dice value, however, the only fact of having wrong information on their provably fair statement should be enough for a legal complaint, shouldn't it?
Please someone tell me if it is enough to put some lawyers to work, or if it would be just a waste of time. Thanks!
The first thing that you have done is right since that was really suspicious and since you have tried to check out yourself what's really going on, better do have some contact or conversation with the gambling platform you have played with so that they would take responsible actions and state if there is some error that happened and maybe your bets might be retrieve.
But once there is no response from them and you have a proof about what happen, it might be considered illegal or cheating already since you have done comparison of the first hash you have than the current you used on playing. That will be the time you must seek legal consultation to know what actions you can do to solve the problem.