I recently sold about 0.13 bitcoins (about 500 EUR) but the guy who bought it said that he would complete the payment in 2 hours, after he said that he confirmed the payment without doing it.
Now I don't know if release or not the Bitcoins, I didn't recieved nothing in my Visa card, but I'm still waiting.
What will happen if I don't release the bitcoins?

Please help me, thanks.