Freelancer — withdrawal hold permanent

Hi, I have completed my last project before 30 days for $ 460. When I requested for withdrawal they hold and excused that there is an issue with the employer account It is clear fraud employer deposited and released money my account has money but when I request money after one month they say there is an issue with employer account employer work was completed before 1 month he doesn't care about account he has done his work now freelancer holding money with excuse that issue with employer account . If there is an issue so they should be responsible for why they are involving in their issue. We pay 13% commission membership charges and 4 % low currency exchange rate after that they hold money permanent