You need to contact the developers of the service you're using and ask for the withdrawal of the added funds. If they refuse, contact the support of your payment processor and announce them that the broker refuses to return the money and they should do the rest, but contact the broker first. Then, depending on the answer and the resolution of your inquiry, access the built-in Help of the software you're using to learn how to change the broker. I also think that's not possible since most of the trading platforms are branded with the MT4 and the software is configured to work only for a specific service.
