Lol! No businesses entity will give you 100 usd without any strings attached. This 3x play amount requirement is a wagering requirement. But if you have really played with 3x of the bonus amount, then you shouldn't face any issue.
Rocketpot has a bitcointalk thread,
https://bitcointalk.org/index.php?topic=5178376.0Also the owner seems to be actively visiting the forum. Raise your concern over there to receive faster resolution.