In my case, a mature lady said she was calling me "on behalf of Openroad Hyundai".  She reminded me of oil change, and made an appointment for the service of my car.  It seems that they are a call center who call customers for car dealers mostly.

Just received 2 calls from this number today and on the 2nd call there was a message saying there were calling from Mazda. Wanting to remind me of my next service?

When it calls me the line is dead and no one is there. When I call back it says the number you have called is not assigned. What???

Got a call from this number, my call display shows it is from INSPYRE SOLUTN

They've called me twice so far and do not leave messages, and I do not answer. I will definitely be answering it if/when they call again!

They called me on behalf of signature Mazda regarding my servicing.  Appears to be a call centre.