I have deposited about 50-200 ETH yesterday
So, you don't know how much you deposited? And it is between 6 and 24 thousand dollars?
I wish I was that rich that I can't remember if I lost 5 or 25 thousand in a day.
If you want to be taken more seriously, I suggest you check how much you actually lost in the first place.
I suspect your account has been flagged as possible money loundering scheme. I never had a problem with withdrawing from Sportsbet and i consider myself a high roller. Granted the amounts are nowhere near what you mentioned and I always played at least one bet with odds over 2,0 before trying to withdraw.
That being said, the policy of having to wager 5x your deposit is criminal and would be very bad if employed on significant amount of users. I understand that Sportsbet has to stop some shady behaviour like money laundering but I am a bit uneasy knowing they can invoke it at their sole discretion.
I will repeat once more that Sportsbet has always been more than fair and I trust them as far as it is possible but sentences like that one in T&C make me a bit uneasy.