All I can suggest is to take a few more photos from different angles and close ups, and get in touch with Brompton direct. ( They have an online chat facility which I’ve found very responsive)
Forward the photos and take it from there.
Brompton have been increasing production a lot, and brought a lot of previously outsourced operations in house, perhaps they’re having problems with processes. Nevertheless they should welcome the feedback.
Do let us know how you get on.