I am also in Dallas and this number shows up as Irving TX. Phone rings, we answer and they either say nothing or hang up. I too have been calling them back and then just setting the phone down. Or I just constantly redial them. It has to be a computer calling.
Caller id was the phone number. The lady asked for the owner by name, he's never here. She said she was with a lions cub or a lying club or whatever, so I just blocked the number.
Called my cell on a Saturday afternoon. I receive so many bogus calls I've just quit answering unless I recognize the number. I receive frequent robo calls from 972-253-xxxx. This a local area code and prefix. The last four digits change all the time. No message is ever left.