Aliexpress website is legit, and the disputes team works very slow but fine.
But you must purchase here very carefully. In this sales portal there are hundred of sellers. Many of them are just scammers who will never send any goods or just will send an empty parcel. Besides them, most of sellers, scammers or not, are just liers. Most of them does not send what advertised or send just counterfeits, and most of them won't fulfill their word about warranties and promises.If you buy here, check carfully number of transactions, % of positive feedback, and comments. You will never get a sure purchase, but if you just want a phone case, look for a seller with good reputation and if you get different color, etc, just open dispute.