So I currently just sold a World Of Warcraft account to an online company. The transaction wen smoothly expect at the end of exchange of emails he added a disclaimer. While making our deal we agreed to no terms or conditions only on trading 275$ for my work on the game. He goes on saying (at the very last email after payment was sent) "as a disclaimer if the account is ever recall I can chargeback my money for up to 2 years, you'll be repoted for fraud to teh ic3.gov, and I will call blizzard and have the account banned, thanks a bunch for the sale" . Do I actually have to agree to that? Or what can I do to prevent any case like that brewing up in the future?