Who called from 2168128121

Called, answered, no response then line went dead.

My number is current and active on the do not call registry as of 3 months ago.

The federal do not call registry is not effective.  It has become so large it is not manageable.  The only way to effectively block specific phone numbers it to spend a few bucks a month with your phone service provider (landline or internet) to have your own personal blacklist that you can create and maintain.  If your only phone is a cell phone you are probably out of luck.

phone calls in 4 hours, ridiculous.

it's a security firm selling GE devices what a scam.
Going to block it myself since the do not call list is very ineffective.

phone rang.  picked it up.  no ne answered and hey hung up...and to top it off THIS WAS AT WORK!