Answered and got dead air. Left the phone on and after about 10-15 seconds someone came on. I left the phone on and didn't say anything while they were going, "hello...hello.....[business name], hello". They finally hung up. Don't care who it was, they were selling something.
I asked her how she had got my unlisted number and she said that I had enquired about lowering interest rates about a year ago and she was following up. I told her that that was not true because I had never made any calls like that. She said she was only going by the info in front of her. They are a sales team looking for business.... report them!