I've gotten about 15 calls in the past couple days. They leave no message.

I get calls from this number constantly. I say hello twice and they hang up. They will call back a few minutes later and do the same thing. It gets really tiring.

Call back gets, "thank you for returning our call.  We have an important matter to discuss with you regarding your vehicle.  This will only take a moment.  Please hold for the next available agent."  Since they don't identify themselves (a legitimate company would do so immediately) I would assume these are either scammers or debt collectors.  Either way, sounds like a good number to BLOCK!

Got the first call from this number today. Caller id showed 'out of area'. No message.

Got 5 calls within the last week. No message.