Terrible FUE hair transplant experience - fixing a damaged nerve on scalp?! (Photos)

I've had a horrible FUE hair transplant in Turkey 3 years ago where the surgeon placed hair where I didn't need it which was my temple area. I had beautiful thick hair there whereas now my temple area is left with no hair and believe the surgeon has damaged the nerves as my hair isn't growing back. I want to try reverse the health of my scalp in temple area before going for a corrective second hair transplant. I live in London and researching trichologists but not sure if they will help.