iPhone 5 Bumper Case Scratching Aluminium casing

Anybody else have this problem?

Worn for about 2 weeks now. The other day taken the device out to have a look at it and it's scratched around the top, with about 20 mini-scratches scattered around the left-side of the power button.

I'm emailed the manufacturer for a response, but otherwise find it amusing that the very use of the bumper has in fact had the opposing effect.