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Does your “friend” bet on same matches as yours but on opposite side? Because there’s no problem if you both on same matches on same exact pick. But if you’re always have a contradicting bet then this will surely raise a suspicion for arbitrage betting which is not allowed in the casino because you can freely get rakeback and other passive reward such as airdrop and lvl up reward without losing anything.
But at least you should recover your initial deposit unless the other account successfully manage to withdraw the balance which cover your initial deposit. This story of yours about multiple account that involves family, friends and other relatives is the common reason of those players caught doin arbitrage bet and different kind of abuse.
No, my friend never even bet on any same game, he is not even playing on Shuffle anymore. Also myself I did not do arbitrage at all.
All I did was play casino games (what can be wrong about that, it's even dumb to play those games in the long run but I liked it just for fun) and some NBA sports bets. I guess they did not like that I won more than I lost. And therefore they conveniently assume I must be the same person as my friend. To confiscate my winnings is extremely rough and very doubtful act, but to even confiscate my deposit it simply theft.
Multiple account is strictly prohibited and assuming you are correct about the other account is from your friend that is not already using it, is your friend account doesn’t involved in anything shady betting before because there’s a chance that you might be connected on whatever your friend does as long as you already have a connection established on same IP.
Casino will not typically use the multiple account violations if both of you doesn’t do wrong on your account. This case is very hard to justify on the forum because both the casino and you needs to provide documents that will prove both your case. On casino side, they need to reveal connection and the exact reason for the punishment. Only @Ndumm can give you exact answer on your issue.