premise: How to dispute a debit charge<br>Identify the charge. Look at your atm statement or debit card receipts. See if you can identify each withdrawal or purchase billed to your debit card.
hypothesis: Disputing a debit charge will always work.
reason: I think the context of this one is important. You will always win a dispute over a fraudulent charge but not a non fraudulent one. I think this is a thin line to consider for the system. 