unable to withdraw, acocunt scammed

I wanted to withdraw asap my funds in amount 6800USD. I set withdrawal request on CRM system. But more than 2 days no reaction from broker. I sent them several emails, I sen them request w´from web page, I set ticket on brokers CRM system. No reaction. Finaly there is a lost on my accout -10000USD from some crazy trade operated by somebody other. Immediately I received email from support to repay this lost. I asked them again why they did not proceed withdrawal but again no answer. This broker is scam or I was scammed by somebody.. What to do now?