Thanks, But if you read the detailed calculations I provided there you will see it was an accounts error on AGL's side that meant I was credited with my first 2 bills, then my 3rd bill then re-charged me for those that I had already paid. As a result, I had to pay a small amount extra and at no fault of my own as some of my usage was re-classified. I have actually received an offer of the same price on gas from another provider and was displeased with the response here so am switching. Thanks,St ...