If the bolt isn’t rounded (im skeptical) then it’s not the end of the world, just needs the correct tool with correct application (second person to hold the tool in the bolt, whilst first person turns the breaker bar). The bolt is tight, but I’ve done the job twice now using the above method with no problems.
I reckon the bolt isn’t in a good way personally.
That is absolutely key to successful removal of the bolt, or a decent cordless impact wrench / air gun.
I had a mate do the same on a rear wheel bearing job because the head of the bolt on that is also stupidly shallow like the cam bolt.
To be fair to VAG technicians / master techs, they aren't usually trained, or even allowed to drill out stripped bolts etc. VAG teach them to be parts swappers. They're not paid to spend hours on fixing something when an entire new part(s) can be bolted on in a lot less time.
Another thing to bear in mind is these cars are now at the age where this is happening. Not all technicians / master techs will have done this job working at dealers X years ago, so it's new to them. VAG's stance on it is - no service schedule. So they were not geared up for swapping them. I remember when MK4 R32 chains used to stretch. My god, the cock ups and hassle dealer techs had with that fiasco!!! Cars returned to customers a tooth out, fault codes, reduced power.....all sorts of agro, and it's a gearbox off job on that car, so a full day's work - to have to do again if it's done wrong. Who was at fault? VW for not properly training their staff on replacing wear items properly, or at all, or their closed book "No service schedule on this part" attitude?
What I'm trying to say there's a lot of "in the know" knowledge with these cars that usually only Hobbyists find out and know, and it's the people who turn a hobby into a business that often succeed in this game.
So anyway, go easy on these guys. I get you're annoyed but banging tables rarely gets you anywhere. Give them a chance to rectify it, but don't pay over the odds.