Thanks a lot, JustLok and iDefalt. Your suggestions have been very helpful!
I have been contacting with the seller.
The seller did not want to pay the shipping fee.
I have replied to him that if he insists not paying, I will escalate it to the Customer Support (after 3 business days according to the rule).
At that time I will tell that this product might be a bootleg.
I've tried to be polite to the seller. To start the conversation, I said the product was not as described. I asked the seller if this could be a exception of his products.
He said 14 days have past, therefore, no refund.
Then, I frankly said that the product is a defective one.
He then agreed to refund, and gave me the address.
I asked him to issue a return label. I also offered him an alternative: to avoid paying the shipping fee, just refund to me, and I will destroy the SD card, then send him a picture as a proof.
He said according to the policy, I have to pay.
I then replied that the case is not that the product is good but I dislike it, but the product is defective. I was deceived. Therefore he should pay the shipping fee.
Now I am waiting for his respond.
If he still does not want to pay the shipping fee, I will escalate it to the Customer Support.
I will update it to let you know how it goes.
Thanks a lot for your help.
If you bought it on eBay, open a a Resolution Case against them, listing the fact that's it's not as described and defective/broken and a bootleg item.
He'll then have to reply back, asking you to return it or offer a refund. If he wants you to return it, he is suppose to supply the return shipping label, so you don't have to pay to return it.
If he asks for it to be returned AND doesn't send a shipping label, escalate it to Customer Support, saying again what the problem is and there is no shipping label to return it and that's it a fake.
CS will then issue you a S&H label (and charge it to the seller) or, if they believe it is a bootleg item, issue you a refund and have you destroy the card and possibly supply evidence of its destruction.
I had to go through the same thing with the SD cards I got, the seller wouldn't respond till I opened a case, then said he'll send a replacement, which I didn't ask nor want, just my refund. CSR said the seller is to supply a S&H label, if not, for me to escalate and CSR would issue a label or issue a refund.
Good luck and let me know how it goes.
I might just also say, as he's sold over 1,500 of them, you wouldn't be the only one out there having this problem... I'd get onto opening a case against him ASAP, and make sure to tell eBay that he's sold over 1,500 defective cards, they'll get real mad at him for that. Make sure you supply the evidence from the program scanning the card to prove it really is only a 7GB card. If he's sold 1.5k "64gb" cards and they aren't really 64GB (which they aren't) then chances are eBay would remove his account.
TL;DR: You're not the only one affected, tell eBay and provide proof that he's selling fake cards to thousands of people.