Sorry about what happened, you believe your account was closed for no reason, so the logical thing to do here now is to hear from a representative of Roobet on the forum, if they do have one, maybe they will be able to tell us the reason why your account was closed, it is always good to hear from the both parties before jumping to conclusion.
According to the email of the support screenshot on the image quoted by @Yahoo, his account was subjected to multiple account accusations which violated the ToS of Roobet.
I’m not sure either if this really ethical or matter on this case since the user has huge number of referrals which means he is organically referring user using his invite link. There’s a high chance that a family member or friend was invited then they both share same IP when they are connected on same internet connection.
But the main point that Roobet should consider here is the OP has many invites which means a potential abused for multiple account is minimal unless he only have 2 to 3 active referrals.