Called and hung up without a word.

I have received several calls from this number today. They leave an incomprehensible message, so I don't call back. I am using the airbandb website to find lodging, but didn't think that they would leave messages that were not from the people with which I am communicating.

Yes this is the company called AIR BnB when you do some rservations to get a room on that web-site and this si the customer service number to reach thenm if you got any questions about your billing, it's a legal number! YES!

I did, I do not know what it was about. I did not call back, because I was abroad. I do not know how they found out my number, because I gave it to my relatives only.

I've received a phone call from this number on my mobile. I'm italian, the voice was an automatic recorded voice, I did'nt understand very well but she said something about customer service.
Has anybody received a phone call from this number?
I'm curious to know where it was from!