Faulty products from istore

Horrible experience at istore!!! Thy sell ******* products at inflated prices! So disappointing! I bought an ipad cover from the istore. A while after using the cover for my ipad, the middle section of the front cover enclosure suddenly bent. I was just using it normally and it completely caved in. It is so bad that I cant even close my ipad with this cover, leaving it completely exposed to be scratched and even worst, crack if it falls. I contacted istore about this and they said that I can exchange it at any istore, which I did. I exchanged it at the Canal Walk store, and after they swoped it for me, they did not give me any receipts or anything to sign. I though it was strange but the guy said I did not need it. A couple of days later, the same thing happened with the new cover, middle section of the front enclosure completely bent. Istore said I could exchange this at any istore. I took it to the istore at the V&A Waterfront to exchange but this did not happen. First they said to me to go to another istore, after which I showed them the email from the istore saying that I can exchange it at any istore. I had to constantly prove to them that the item is faulty, which a person can clearly see. I am so disgusted in istore's service in this process, and not mention the terrible products they sell to their customers, which I assure you is not cheap at all. All I want is a product that works, but istore made me drive up and down after them and the way they treat their customers is appalling!