Deceptive Amazon

I ordered 5 items from Amazon on the same day/time using the same card and yet Amazon charged 3 of those items as debit - and I was charged a fee for each item by my bank - and 2 items as a Visa - and I wasn't charged a fee. I have never experienced this before. It has always been used as a Visa card. I contacted Amazon and their first response was that someone I know probably used my card without my knowledge and that was the charge. The charge were for several pennies and you can't even buy penny candy for a penny anymore so that excuse was stupid. I then faxed the info Amazon wanted and got an e-mail today from someone else saying it was my bank's fault. I called my bank and they said that Amazon chose how to process each item and because someone at Amazon charged several items in the same order as a debit I was charged the bank's debit fee. The bank is returning the fee to me as a "good-will gesture" and I thanked them for that. I then wrote Amazon a third time and told them what my bank proved to me. It seems Amazon is being very deceptive in how it handles it's customer's transactions. We are at the whim of whatever Amazon employee is working that day and how he/she decided to process each item in the same order. They do have an "opt-out" section for saved card information on your account, but for security reasons I never leave my card information after an order is processed and they don't seem to have an "opt-out" for people like me. It would be one thing for Amazon to say that they can decide themselves how your card will be charged unless you "opt-out" of the debit pin-less transactions and another for Amazon to do what it did to me: charge things at random for the same order and then when confronted by me they first blame someone I know and then my bank when in reality it is solely Amazon's fault. They need to stop deceiving their customers otherwise they may not have any to deceive.