OP - make the dealer fix it. If they won't, dispute the charge with your cc company.
For others considering it. I had my chrome trim professionally wrapped in matte black vinyl - $300. Looks great and no risk of leaking.
2011 E93 - Space Gray - 6MT/Silver Novillo/
OE Tuning/Gruppe M Intake/ACS Springs/Vorsteiner CF Type I Rear Diffuser/Textured Matte Black Custom Powdercoated OEM 359s/Painted Reflectors/Matte Grille, Hood Vents and Side Markers/Arqray Race Exhaust/MS Pulley