A man came to my door saying he was going to make ...

A man came to my door saying he was going to make sure I was on a fixed rate. Said he needed to see my Bill. I was taken back by this and said if your associated with my provider then you should have access to my bill. He started just repeating himself and when I said I would look into this he got frustrated walking off he said "okay man just trying to save you money"
Pushy attitude and acting like it's just a normal stop asking for my personal information.