I purchased a GPU miner from the seller's website; They accepted PayPal payments. After 3 days I received no order confirmation. After contacting them via email they said, "Sorry, we sent you a lot of emails. (they did not) This model is out of stock. There is a complete machine with the same hash. It is more than 220m. The graphics card has been used, and the price is 4000$". Q: I want a working product or I would not have started this transaction. What is the best way to protect myself now that the seller wants more money for a used product where it is unclear if the $4000 unit has the same or better capability as what was ordered from their web site?
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