Definitely a scam. They have also also used 646-517-0254, 646-517-5573, 646-432-4726 and 646-604-7813. There are probably other numbers they have also used, Besides the different numbers, the fact they never leave a message is also a give away they are scammers. If you don't have one, get a call blocker.
Just got same caller with caller ID showed as unassigned - did not answer and automatically blocked by my call blocker which I have programmed to only allow calls thru that I have programmed in to accept. Makes life a lot quieter and I can look at the blocker log and see all those scam calls that never got thru and was hung up on without even ringing thru to my number