Okay.
Look for controllers as physically identical as possible to your controller. Your controller may actually made by some other company but just "branded" (labeled) with another name and logo.
Colors may be changed etc..
However the drivers for the original controller model may work with your branded "clone".
Or, if not fully compatible, you may be able change/reconfigure the mouse buttons so they work as you require.
Does take some time and effort to work through it all. Especially if the controller you purchased was deliberately modified for some proprietary purchase. "Compatible" only because the plug fits....
You may need to look into options such as presented in the following link...