Automatically increase the position, unable to close the position, violent explosion

The same situation happened for two consecutive days, 0.5 lots were entered, and suddenly it changed to 5.4 lots or 5 lots, which was basically the number of lots I could buy in full position. After that, I was not allowed to close the position. The first time I was fortunate to set a stop loss, but the second time, I was not allowed to set any stop loss and close the position at all, and forced me to liquidate my position. I made two transactions with the mobile mt5 and the computer version of the mt5, and it felt like I was hacked. Completely inoperable for the user. So do not use this broker, there is no way to quit.