Buyer is trying to scam me, abusing the dispute system.

This is my invite code:FAKFD9

Take a look please! The code I sold was still not redeemed when he opened the dispute and he kept telling me to send something to some shady email, basically abusing the dispute system as the code is working!
Please do take a look!

Please open a ticket and add all the information so we can better understand, also add the order id please.