Sorry @Mikeyd1; can’t verify whether they’re all like yours as I don’t have a Golf but I doubt yours is representative of the norm. IMHO yours is shocking and should never have passed factory QC checks or PDI at the dealership prior to you collecting it. So much for the so-called legendary German build quality………..
I’d be getting back to the dealer without delay to get them to sort it PDQ; the longer you leave it, the greater the risk of the dealer - and / or VW - might try and wriggle out of rectifying it, saying the deformation has been caused by contact with something else.
This a picture of a mk8.5; alignment of the top of the rear bumper is as it should be.

Please report back for the benefit of other forum members once you’ve spoken to the dealer, along with progress of getting it rectified. Good luck, hope you get it sorted quickly.