Serious slippage, suspection of operated mannully. Clone platform

I had succesively deposited over four hundred thousands at XS for five years. Everytime I deposit, the trends goes different direction when I place orders and liquidate. Till today, I suddenly find that the wit cruel oil has different price than other platform for one or two dollars. I ask the customer service, they said that it is due to different systems. I ask customer manager, he does not response. He will response once I ask about deposit. I suspect that this is a clone platform