It's really terrible if it's true. I can't phantom why one of the established brands of cryptocurrency betting companies would do this. I hope they rectify this problem for you because it just unfair.
They were caught using the same IP address thus breaking the rules of the contest that they joined in. I don't see anything unfair with that because it's their rules they could put anything they want but in return they have to pay out the prizes.
they should response you to why you actually banned.
They already did, check the post from LoyceV above.