unknown caller no message left

They called twice, 3 hours apart. I answered both times and they hung up right away. Called them back and some guy answers saying it's an event registration and asks if I got a missed call from them. I didn't answer. They hung up.

This number calls daily, but does not leave a message.  I called back and it brings me to some event planning operator?

Update.  This is from Commenity Bank.  They call from a variety of different numbers.  Although none actually get routed back to their call center.  I think they steal numbers to try to trick people into answering.  When I answer, they try to get me to set up a payment plan for a loan I never took out.  They can give me no information about my loan.  Despite telling them to send me a bill, they insist they have.  I have never received a bill!  They harass on the phone for personal information.  I refuse to talk to anyone from this bank, since they cannot give me an accurate number to call back on!  Thus any possible loan that was taken out will never be repaid unless they step up to ethical banking practices!  SCAM ALERT!

I left a reply at the other number you posted in.