Who called from 6468449090

Calls once or twice a day.  Never leaves a message if I don't answer...hangs up if I do answer.

The caller kept pushing buttons when it went to voicemail and then finally hung up.

This person had my work phone number and called me to try and sell some sort of magazine for retailers. I told them I wasn't interested. They called back several times and didn't say anything  / hung up when I answered .

Called 3 times , no message. When I call the number message says this number is not in service

Kept getting calls and as soon as I would answer, they would hang up.  Never left messages either.  So today I called.  They added me to their Do Not Call list.  We'll see if that helps.  I look at it as progress that they answered.