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How to block my friend's cell phone and home phone?

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Someone is asking for me and some people ohave contacted me, like ex-sister in law who I don't even know her phone number?
I have a friend, that the company does not have any rights to call him, when he is not involve with it. How do I get his cell phone number block and his home phone number, because somehow they got his cell phone number, which I do believe that they were hacking it.? How do I protect him from all this? Even though I tell the company to stop calling his cell phone and home number, they are igoring me to ask them to stop.

Jonna