Get off of my cel phone !!! If they cannot even leave a message that tells you which purported credit card company they represent, then they are scammers.
credit card scammers -- I get so many -- for years. I don't answer. Quite a few numbers are used.
Sometimes it's my own name and phone number calling me! This time it said Minnesota and was from (651) 401-7950. Yesterday it was another number. Occasionally I look the number on this site...it usually says as noted above -- scredit card scammers. One of these days I'll get a call blocker.
Against my better judgement, I answered. A long silence ensued (passing the call from the auto-dialer to the "agent". I hung up. Could be a regular scam or a "phishing" attempt looking for personal data.