Silicone case breaking down on iPhone

Has anyone had any joy getting a replacement or is there a way to leave a review on the apple website.My case is 9 months old and has broken away on the corners.The damage is not from dropping just getting in and out of my pocket, this is a poor quality product with many others having the same problem.

I am sure if there was a place for reviews on the apple site it would have been reported numerous times as it has on other sites.Had this been the case l would never have bought it.