Apple MagSafe leather case snapped

Has anyone else experienced this issue.

During normal usage of a case after 4 months my premium apple MagSafe leather case has snapped upon removing it from the phone. Snapped at the volume and standby button so is now unusable.

Apple Store and support says despite having a 12 month warranty this does not cover accidental damage?

how is this accident damage. Am I not suppose to remove the phone from the case to clean my phone on occasion?

Terrible service and I expect this would fail at trading standards!