Who called from 4842439169

I always answer "Denver police department, fraud division.  How may I direct your call?  This call is being recorded"

Blocking is good on a cell but is there a way to block when they call landline?

Those Do Not Call lists are worthless

Non legit businesses do not follow the Do Not Call List. They take out one phone number and eventually shut down that number and start another. This continues on indefinitely. Pressing 5 only lets them know they have actually reached a working number where someone answers their call. You would do better not answering any call you don't know. If it's legit, they will leave a legitimate message and not one that says: "thank you and have a good day". All they want is for you to call them back, once again, so they know they have a real working phone line.

Blocking on a cell phone is pointless, they just change their number.