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How is it possible that a preauth sticks to a credit card for 30 days, even though the goods have already been delivered?
This is not a normal occurrence, and you have every right to be annoyed, but the technical way it usually happens goes like this: What can happen is when the merchant incorrectly completes the transaction without referencing the pre-authorization transaction. The bank effectively doesn't "know" this is the same transaction, so they process it the same way they process any other purchase, and it has no effect on the pre-authorization and related held/pending transaction. As far as the bank knows, you purchased a second set of blinds in the store for $200 and are still waiting on the first order to come in, they have no idea the store screwed up. The reason this is possible is the purpose of the pre-auth in the first place is that it is a contractual agreement between the bank (credit card) and the merchant that the funds are available, will be available except under rare special circumstances, and thus they can go ahead and process the order. This lets the merchant be secure in the knowledge that they can collect their payment, but you aren't paying interest or monthly payments on something you haven't even gotten yet! This system works reasonably well for everyone - right up until someone screws up and fails to properly release a hold, makes a second transaction instead of properly referencing the first one, or the bank screws up their system and fails to correctly match referenced pre-authorization codes to purchases. The problem is that this should not be a normal occurrence, and the people you are speaking with to try to sort out the issue often do not have the authority or knowledge necessary to properly fix the issue, or its such a hassle for them that they hope you just go away and time fixes the issue on its own. The only sure-fire solution to this is: make sure you have so much extra credit line that this doesn't effect you and you can safely let it time out on its own, or stop doing business with this combination of merchant/payment that creates the problem. Back when my credit limits were being pushed, I would never pay at gas pumps because their hold polices were so weird and unpredictable, and I would only pre-pay inside or with cash to avoid the holds.