I own a small company, and one of my suppliers has a written policy that requires a 30% deposit to begin any and all PO's. I have dealt with them for 2 years, and they have always followed this policy, and have never indicated there was any change. A few months ago I emailed them a PO but did not send a deposit becasue money was tight. I then cancelled the PO two months after submitting it. They have now said they decided my credit was good so they processed the order anyways, it is ready, and they expect me to pay for it. Am I obligated to pay for this order? Is my written PO more legally binding than their written policy?