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Didn't your parents tell you, "Never speak to strangers?"
If you get a call from a person you don't know (a stranger), DON'T ANSWER! It's not going to hurt their feelings, but it could hurt you in more ways than one. Simply put them on your personal Block Caller list and then delete the call and message. Don't assume the government's Do Not Call list is going to handle it - it won't. File a complaint with them!
Never give your cell phone number TO ANYONE! That's personal information! If you do, you might as well give them your house keys - you just gave them permission to call you ANYTIME. Never call them back, you just them a working phone number. Do your homework on these people. Make a note of the phone number, search them online, get an address, and sue them. If that's too much work, than you have no right to complain and you'll keep getting called. They are abusing your phone service. Stop assuming the government will handle these people - YOU HANDLE THEM!