I don't answer calls from unknown characters. They have the nerve to leave an automated voicemail, definitely scammers. Receive a gift using claim #524. The gift of a headache and stolen identity, no doubt.
Good luck on that one, I did it countless times and they still call me even more now. But I encourage people to opt out at the number and fill out the FCC complaint so eventually enough records of their calling illegally gets them a FEDERAL prosecution.