After a little research, I found out that the buyer that have caused all this trouble to me is an employee of a large bank in the U.S. This makes sense, because PayPal stated that "the chargeback was initiated outside PayPal, by the card issuer", which, in this case was the bank institution he works for. This fact makes things even clear, on why PayPal couldn't dispute that chargeback on my behalf, after asking that bank to return the amount to my account. This is more than clear that this fraud-buyer had a plan from the very start and he took advantage of both the protection mechanism and his position in the bank.
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