I would not communicate directly with this person.
Chargeback - this is a specific process where the buyer paid with a paypal account backed by a credit card and has his CC company take the money back from paypal.
If you qualified for seller protection, paypal will refund the CC company and eat the loss. If you did not, they will take the money back from you.
If the money is taken from you then small claims court is probably your best option. You should have the documentation you need to file your claim and to win.