Obviously they are not happy if you more than doubled your trading account in one trade, must have been on the other side of it, so your win is their loss. If they failed to hedge against that risk in the market its their own fault and should pay you what you have earned, and fire their risk manager!
I find then GUILTY until they pay up.
Ps. you seem to be taking on huge risk yourself in doubling you account in a trade, you last longer in this game taking small bites, than trying to swallow the elephant whole.