Do you have the transaction id which can be checked and confirmed on the blockchain? That would provide your claim with a little more substance. Right now, I cannot say if their reason for closing your account is a correct course of action or not because I do not know their side of the story.
At the very least they should return your deposit but the lesson for you and everyone else to learn here is you must read terms and conditions when you sign up to any casino or gaming website and you must be prepared to still not have your funds released even after you send your KYC.
There are many scam websites that claim to be legitimate but they are a front designed to fool people in to sending their personal documents to them. I cannot say this is what is happening here but you should be careful.
they closed my account so i cant access i have proof of deposit

it's absurd to take all the player's deposit and winnings and give a ridiculous nonsense excuse
Very very absurd mate. How could they do such a thing to their new member, blocking and taking his funds away and not granting him access to his dashboard. It is very absurd indeed.
I think this is a lesson to be learnt by OP. Next time you will have to do some research and conducting due diligence before getting engaged with casinos. If you had checked trust pilot review then you would have had a little clue about the exchange but it is unfortunate that you did not do all these but was quick to get onboard and making deposit.
This is a lesson learnt and I believe next time you will have to go the right thing before trying to register on any of the casinos.
Do well to present all the necessary evidence as requested so that some forum members can take it up from there on your behalf.