Calls several times a day but hangs up when a I answer. Who is this?

I think it's a Pharmaceutical company based in Martinsville, VA

Telemarketer/unsolicited calls

Received 4 calls in one week from this number, including a Saturday morning. They claim to be with the MD Dept. of Health even though my caller ID says they're in southern VA. Agent says they are surveying MD residents; when I explain that I live in DE, the story changes. Suddenly it's a *national* survey and my location is irrelevant. These are unsolicited calls to a cell phone which is listed on the national Do Not Call registry, so it's shady at best no matter which way you look at it.

Stop calling me!