Simple and straight forward
Go somewhere else. If they don't know who to do to then it won't be done right,
And yep single sided adjustment is the norm on some mk2s, my gl was like that,
They set the none adjustable side up on camber then set the toe to within limits then lock the steering wheel in position.
They then do the adjustable side to within limits.
Finally moving the steering wheel to the straight ahead position.
As I said, go elsewhere - they don't sound like a garage I would give any money too !