Im not from Lahore, so cannot help you finding some repair guy,
But if you know about Car wiring (or simple electronics) then you can first check it yourself too by opening it. Probably some wire has broke or some contact point is damaged.
I have first installed Retractabel mirrors in my Baleno, then one day someone folded it badly on the reverse side so it stopped working, and I repaired it myself.
You can check the below threads, maybe these can help you if you want to repair it yourself:
https://www.pakwheels.com/forums/d-i-y-projects/187418-my-new-ride-baleno-jxr-2005-installed-retractable-mirrors
https://www.pakwheels.com/forums/d-i-y-projects/194962-baleno-retractable-mirror-repair