buyer tried scam me. I need advise

im selling gift card codes ,
today one buyer tried scam me, showed me screen that i have sent redeemed gift card
i also reported gift card for frozen balance via support email, said that you will lose balance, after this all he understand he will lose his account and money he said that code redeemed by him.
after this i have sent email to store that no need frozen gift card balance.
if buyer lose his balance. have i any responsibility?
because he tried scam, all evidence on chat,