I admit that this is not fair of them, especially since they do not offer any explanation and do not return your deposit. I would continue to be persistent and try to contact them through social networks, because as far as I can see, what you experienced is not what the reviews of other users show - although it does not necessarily mean that the positive reviews are not fake in some cases.
If it's an amount you can't afford to lose, why did you invest it in a casino with which you have no previous experience? $100 would seem like a much more logical first time deposit.
Well maybe it was a mistake to deposit there 1k, however their advertisement made them very legit in my eyes.
Are they active on this forum maybe?