If you lift the bonnet and look at the nearside top of each suspension turret,
near one of the three nuts is a silver pin with a hex socket head - about 4mm diameter.
To adjust camber slightly you need to remove that, or drill it out. This is what the tech was trying to remove.
(Its a locating pin to aid assembly on the build line thats all)
The three top nuts can be loosened and the whole strut top slides in/out a few mm.
I doubt you will get anything like enough adjustment, and as a DB says , the lower arm or posibbly the hub carrier is bent.