Breakers can & do make honest mistakes. It's unlikely they would clean off 15 years of baked on brake dust to ensure there's a genuine p/n stamped on the wheel...

I've returned a couple of items (faulty fuel pump that worked fine when they bench tested it but was failing when under pressure for example) over the years and they've had no problems refunding me.

Have you talked to them at all since ? At the end of the day, they want your business again in the future....