Calling my business phone continuously after asking them not to

Most likely a fake collector. She had the last four digits of my social security number, my address from four years ago and another in Riverside, California, I have never even lived in Southern California. Promptly reported her to the Police department.

Do not need calls from unidentified source. I can't afford the waisted time on my phone! No message left, and when number called back, no identification as to the (presumably) companies name etc.

Been called several times by this answer, my mams answered the phone twice when they've rang. The first time they were silent, the second time they asked for me by my first name o_O

keeps calling my cell phone never a message on my voice mail