Well, As far I know. Wintomato is a Sister casino of Casinoroyale.bet. Casino royale had a few Scam accusations before. You may check it from here.
"Scam Warning" (WITH PROOF) www.casinoroyale.bet proved not provably fair -i got scamed by casinoroyale.bet(Scam Alert) www.casinoroyale.bet is a scam casino3) Poor support: moderators seem to be completely useless in serious questions like withdrawals. Seems like they are playing a middlemen role and just pass your message further to the administrators. Email support does not answer more than 5 days already.
About this one, I guess Moderators doesn't have a back-office and they work like a middle man. I don't know if it's true. But, moderators are mostly hired just to manage the community. At least wintomato and Casino royale doing this. I guess Moderators doesn't have access to users' data. So, They are unable to help you. Based on your post, I can say this is a shady scam attempt. No matter how much is the amount.
I can suggest to you one thing, I don't know who is the Goldenberg is. But, The casino owner is Anil. He was my good friend. I don't have had communication with him for the last 8-9 months. I guess sharing personal information is not allowed here. But, I can share the owner's Telegram handle. You can knock Anil on Telegram @anil56380. Is support is not responding. You can tell him about this. Good luck.