Who called from 2028629000

They call and hangup as soon as I answer.  Have called to complain to the company, however, the calls continue.

They have called so many times and they never left a message, This is very ridiculous.

Received a call from 202-862-9000 (unknown caller ID). When I answered a man's voice said a word I didn't understand, there was some clicking sounds, and then he hung up. Reverse look up result was Morgan Stanley, 1775 I Street Northwest Suite 200, Washington, DC  20006. Possible robocall.

Received a call from this number while I was at lunch. I asked around and the same person has called several of my coworkers. Someone must have given them a phone list from my office. Very unprofessional. These salespeople then start calling each employee, keeping them from work.

same.....but how did they know my husbands name?