Thank you Lawrence for your reply and feedback,
As of 1st October 2016 I increased my price. Yes have smart pricing on and changed minimum to new price. Have had 2 booking at correct rate already. It was a challenge to change price setting as defaulted to a lesse amount eventually after about 6 goes got it sorted.
I have had this proble a couple of times since I started my listing. Think may time call Airbnb. I agree I think having smart pricing on screws things up.
Take care from down under
Graham