Locked accounts usually don't get any replies. I honestly don't think you can get $1200 back. Of course, you have to try your luck to the fullest. Hope you can get your money back.
Not most of the time but this is entirely dependent on the website itself as some of them has a bad customer service especially when it comes to gambling platform. There are platforms that are very active especially on customer service and I already experienced both things.
Some may take only a few days to reply but some of them takes ages for you to receive response. Even good gambling platforms has bad customer service but not all of them. So better to gamble on platform that has good customer especially for withdrawal purposes.