Who called from 2021548749

Have been receiving calls from this number.  I attempted to call the number back, after one missed call, and the number could not go through, stating that the number or code I dialed was incorrect. Sometimes if I answer the other line just goes dead... other times, I answer, and someone on the other end responds, and then hangs up.... Very irritating.

I have gotten a few calls from this number I never answer calls from unknown numbers how do I block this number from calling me

This number called me 4 times within 30 min and i tried calling back and it didnt work.

Called my phone. Didn't answer. Best to ignore weird are codes.

Keep getting calls from this phone # answered, and the man spoke but then hung up!