Classifieds what should I do?

Have a gamer laptop on eBay classified ads sold by last name. I have also received money and everything is just the problem that I obviously had a typo on the video card and therefore wants to show me because he thinks I have deducted him on purpose. What should I do?

Refund money and have laptop sent back

He does not answer me anymore

Write it anyway and pick up the mail history. Do not you have to worry, you're safe.