Sorry to hear about you loses.
But the problem here is the margin requirement.
I assume you've opened you account the minimun that Forex.com accepts and the leverage used was 200:1.
FOREX.com > Trade > Account Types
That means for every mini lot you've used $50 for margin.
FOREX.com > Support > Trading Handbook
If your traded pair (example EURUSD) has become against you 200 pips your account is dead ($50 margin + $200 pips lost)=$250.
Every broker would kill your trades if you have a margin call. Forex is not like futures. 0 margin = 0 money to trade.