I've had similar problem, but I changed my mind about the phone storage. Cancelled original order, and re-ordered the same phone with 32G of storage. I sent phone back in box with printed label as requested. It got hung up in a warehouse somewhere other than where it was supposed to go. I eventually got the order and the right phone. Someone in shipping read the address label wrong and Amazon admitted it when they found the returned item.
What I do if I think there might be a problem is - I order on the computer, not just any device. I have a printer hooked up, and I print and also keep a print screen pic in digital format. Any problems, it's right there on Amazon's page with Amazon's URL.
I print receipts for most questioned items anyway. If I order a book from Baen, I simply save the order and the email that states the order and payment on the computer. Can double check on credit card postings.
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