I hate to say it anyone could of put this information online,your cable inc Electric inc,your bank & etc
My sister found out her private number was place online as you did.
When I say anyone can place this information online I do mean anyone. When I moved to the state I live in now. I started to get phone calls for a person. I have always told them this person doesn't live here & i do not know them...To make a long story short It was a bill collector who thinks I'm this person or knows this person. I did a number search on this lady and found out where she lives & her new number ..A google search was coming up my number but with her address. I then did a number & address search on myself and everything was correct. When I threaten the bill collector he went in put my DH name on her address.& change my number back to her address.
I then had to go undo everything he did.