I can't tell you just how annoyed I was. If rented or private properties had different tariffs I could understand it. I might even be charitable and understand if I had ever defaulted on a bill. - I haven't, and note that the bill only arrived Thursday, and I was having it adjusted to correct a low reading.
I had a company contact me earlier this week. I had (allegedly) entered a competition and they wanted to check a few details!
When I point blank refused (like you, I had no idea just who they were) they said that my entry had now been cancelled.

I was heart broken.
I remember years ago I guy I worked with warned me that this type of thing would happen as personal data became more and more valuable. I have now decided on a deliberate policy of misinformation. - I will never tell the same story twice.