manipulation of sell order

I entered a sell position and close with a loss of about 7.6 Dollars..when I clicked on close with a loss ,when loading the closed order a buy order was use to close the sell order ,but the buy order appeared fast and my order was closed ...only to open my mt5 and saw a buy order with a loss of about 8 dollar...I didn't open a buy order or did I give any one my phone or PC ...I reported to a deriv agent i know because he introduced me to deriv.and Only for him to give me nonsense excuses...