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6 months ago I purchased my vehicle from a licensed dealer. Recently I took the vehilce for a warrant at a VTNZ testing station which it failed as the headlights were out of alignment and focus - what they found was that at aometime in the past the left light fitting had been damaged and siliconed/glued back together in such a way that it could no longer be adjusted. This was backed up by a AA service centre who said the only way this could be rectified was for the headlight fitting to be replaced.
I approached the dealership that i purchased the vehicle from who agreed to look at the car. I took the vehicle into them and they took the vehicle to a garage that they use. It was returned to me some 45mins later with a warrant telling me they had sorted the problem. Now my problem is this a friend who is a mechanic was curious to see how they had fixed the lights when 2 other places couldn't and found that all they had done was break the top mount which had been glued. Is this a) a legal way to 'fix' the problem or b) have I been left with something that is going to give me more headaches at future warrants?
And if the latter were do i stand in expecting the car dealership to attend to actually fixing the issue.

Thanks

At face value, this seems to be something of a patch-up repair. If they've glued the lamp in place in order to get the aim right to pass the WOF it's possible that with heat generated from the lamp, it will break again in future.
Assuming the aim is currently correct, it is not illegal to issue a WOF, but if there's any doubt about it being correct, maybe a re-check at your VTNZ station might confirm this.
The proper repair is to replace the lamp as when it is glued in place it cannot be adjusted in future.
I would be requesting a replacement lamp (second hand would be OK) as the problem was clearly pre-existing at time of purchase and it is entirely likely that it could give you problems in future.