Slippage, disconnection with no reason and bonus cheat

So if you go long in London Gold, you place the order at the price of 1900yuan/ounce, but the bid price will rise to 1905yuan/ounce. Sometimes the spread skyrockets and my worst experience was 500 pips, which is 10 to 20 times the spread of a normal platform. The platform disconnects at the very moment of your closing out, and when you log in the market has already fluctuated! They play the trick of "deposit $200 to get $300" but you must trade 20 lots in order to withdraw(the lowest spread is 70-80 pips at usual). That is to say, you should first surrender $1400-$1600 to the scam platform for commission. This trick is really deceptive.