Calls regularly, leaves no message, on do not call list

Got a call from 240-800-9544 in the afternoon on Dec. 7, 2016.   No message was left.  When I called the number today I could tell it was a telemarketing center and when I asked who they were, they hung up on me.

Dec 22 at 521pm....our dinner time.....caller ID showed "Triple V".  Let voice mail pick up and no message was left.  Put this number on call block

Got a call from this number on my cell this morning.  Caller ID showed "Maryland".  No message left.  Did not call back.  After reading comments above, glad I didn't.  I don't know anyone in Maryland and I don't answer unknown/unidentified calls.

Got a call from 240-800-9544 from Bethesda MD on Feb 27 2017; it was an electronic voice saying I needed to call them immediately regarding my credit card however they didn't indicate what company or what the issue was so I hung up. I have received calls from my credit card company before and it is always a live person and they always specify their name, credit card carrier and the issue, not a vague urgent message about my credit card.