Primary Financial Services review: Creepy, just creepy

This company continues to call our house and harass my mother in an attempt to collect someone else's debt from her. There are messages on the machine from a Mr. Peterson at x3226 asking for a company that has nothing to do with us.
It turns out that company's owner has a name which is one letter away from my father's name. My mother has repeatedly told this Mr. Peterson that they have the wrong person, the wrong #, that it's not our name, we have no such company, and that my father has been dead for 10 years. After telling Mr. Peterson this, he demanded my father's death certificate, and said 'but you do have property, don't you?"
There is something very, very wrong with this company and its tactics. My mother has repeatedly told them not to call, and they continue to harass her.
What business do they have knowing our private property information or seeing my father's death certificate. It's not my father's account, we and our phone line have never been connected to the company they are seeking, and we have never heard of the company they are trying to collect on.
We just can't get it through to them they are simply calling the wrong people. It seems as if they are intent on collecting this debt from whoever happens to answer the phone, anywhere, any time, with absolutely no regard to whether or not they have reached the account holder they are seeking. Creepy, just creepy...