This number, 720-634-7483, has called, with Caller ID showing "Washington, DC", for some months now.  This area code is from the Colorado area, so this is obviously a scammer spamming a " spoofed" caller number.  Be careful - for your safety, do not answer or call back this number!  They are scammers trying to get your personal information, steal your identity and cheat or trick you out of your money and resources.