This number calls once a day and hangs up if I answer.

This number calls more than once a day and doesn't leave a message! I have an answering machine and sometimes am right next to the phone when this happens. When you try to call it back, it hangs up and nobody answers! Fishy!!!!!

Claim to be World Animal Protection organization.

Calls once a day, doesn't leave message. I'm assuming it's some marketing thing

I just had a missed call from this number but no message

Calls at least once a day and won't leave a message.

who is calling me?