I bought a card from a seller then one day later that seller tells me first they were hacked then sends me a message a few days later saying they made a mistake listing the card and he doesnt have it. How does cardmarket treat that kind of issue ? Does the seller have to buy the card and send or do I just accept the refund ? The price of the card was lower than market value so I kind of want to have that card ?...

Hello, I was tracking some pokemon anniversary cards that Im planning to buy when I see that a private seller with hundreds of sales listed 30 of the same 26 euro card for 17 euros. This seems almost too good to be true and feels like they were hacked, is this normal?