We are always happy to refund 100% of your purchase as long as our system shows you have not downloaded the PDF file prior to asking for a refund.
Our back end system shows how many downloads are associated with each sale and connects those downloads to your ip address. Claiming you have not downloaded an item when you actually have is considered theft and will result in no refund.
We clearly state in every product listing on our website that we are selling PDF downloads and not printed books, so please do not ask for refunds claiming you purchased a printed book from our website. If you do not read our listing completely that is not our problem and the purchase is completely at your cost.