Also from (240) 374-4568. They left a message for someone with a different first name stating they are a debt collector. I called back to ask them to remove my number from their list. They asked for the last 4 digits of my SSN. A pause while they "looked up my account". They came back and asked if they may have my full SSN. I told them "No you may not". I explained again they had the wrong number and they apologized and hung up quickly. Sounds like a scam to me.