I did not receive a response to the letters.
That's why it is important to read Terms and conditions of every site before using it. T&C differs from site to site so don't assume that it will be same for every site. Eitherway right now you can only ask for initial deposit to be refunded but since you have deposited into a site that recently came up/no one heard of yet it is much likely that they might not refund it as well.
Reading the Terms and Conditions doesn't guarantee that you won't get scammed eventually.
OP,your deposit is gone and you will never get a refund.Just leave negative reviews about betodds everyone online and make people aware that this is a scam.This is the only thing you could do.