Keeps calling me all the time, then I block and they call with a slight number difference. They're just companies that check if numbers are active and answer.
Ignore and block.

Just got a call. Ignored, thx.

Called - didn't answer and no message was left.

I don't know this number it called and left no message I'm on the Do Not Call list and this is a cell phone

These guys are pathetic. I hung up on them so they had their coworkers call me back 6 times in 10 minutes. I reported them to the FCC but I doubt anything will happen. I would definitely just not answer if they call.