1. A drug needed by diabetics can be dispensed by a pharmacist without a written prescription as long as the customer knows the strength they need. Once a customer leaves the store with a prescription medicine the pharmacist may not accept a return (NY State law). A 17-year-old diabetic walked into a pharmacy and asked for insulin. They told the pharmacist that they did not have their insurance information and would have to use a credit card. They handed the pharmacist their Visa card and were given the doses they asked for. The normal charge for the insulin they were given was $100. When they looked at the Visa charge it was $600. They tried to return the unused insulin and cancel the charge. The pharmacist refused to accept the return or cancel the charge. The 17-year-old then tried to reverse the charge on their Visa because they were overcharged. 
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3. What should the outcome be?