[ Parked the M3 in a private driveway over new year while away in a weeks holiday, on return find a smiley face crack in rear window from side to side. Quick search shows similar cracks have blighted other drivers. Booked a service 90 mins away 16 Jan, stating explicitly that this should be repaired under warranty and attaching photos showing no external damage. Response is “need to see it to determine validity of repair”. Not chuffed with this and hope they don’t mess me around. Advice and suggestions gratefully received. I love the car but this faff is tiresome.