just get your money back I don't know the laws in your country but in the US knowingly selling counterfeit products is illegal. I would get in touch with the police if he wont give you a refund since you overpaid as it is.
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Question your formating the card with sd formatter 4 and using the options
Format type - Full Erase
Format size adjust - On
then running the card through h2testw with write+verify selected correct?
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Question your formating the card with sd formatter 4 and using the options
Format type - Full Erase
Format size adjust - On
then running the card through h2testw with write+verify selected correct?