this is fake broker very bad experience

I have placed trade in MT5 but after some time i tried to close the trade but it was big mistake i opened in seacrestmarkets because it was in -800 i tired to close it many times but unsuccessful after some time due to company error and many times i tried to close this very bad experience i lost huge money in one trade due to this broker this is big mistake in my life please suggest where we can complaint about this broker .i have attached photo about this trade