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I'm sure this person changes phone numbers regularly since he is running scam.
He claims your (Amazon- for example) account has been hacked and there are strange charges on your account.
He will "be able" to remove the hacker's intrusion.
All is a lie. They (he works with another person who pretends to be the supervisior.)You are to get gift cards because they have Security numbers that they use to stop the hacker.
HE is lying. He wants all the information on the back of the gift card and steals the money.
Old scam but still targeting senior citizens.