Sounds like a debt collector to me, that's why they don't leave messages - they can't give info to anyone but the person who has they debt. That's why they say they have an important matter for "***" and give a ref #. The ref # is your account number in their collections dept.
I got a call from this number but when I answered it, they didnt say anything. Tried calling back but it kept giving me a busy tone.. any one know who this is?