"vantiv" on the caller ID.  Called early in the morning. Left no message.  There are other posts with different numbers referencing Vantiv.  Some posts mention they are legit, while others say the number is spoofed and these are scammers.
Posts mention Vantiv fraud department called saying your credit card was used under questionable circumstances and ask for info.  It also sounds like scammers are posting to 800notes saying it's legit.
CALL YOUR BANK OR CREDIT UNION TO VERIFY.  Don't call Vantiv or the number that comes up on your caller ID.
I called my credit union and they said everything looks fine.  They have a top notch fraud department.
This is likely a spoofed number.  Scammers are evolving!  BEWARE!