missing deposits aren't that common I guess with DOGE in 1xbit , I read some people complaining about missing deposits for other coins mainly that have smart contracts
1xbit is already a known scam and they never visit this forum , so no one can help you with this matter except their support
I got all my deposits when I used to play with them before they scam me , all were BTC deposits though but in general they don't scam users by not crediting deposits ( they close accounts and block withdrawals instead )
What @SyGambler is writing is absolutely correct - so far I have not heard of deposits not arriving but I have heard complaints regarding withdrawals. Even though there also seem to be happy customers, not sure what is going on really...