He didn't receive the classes he paid for, and yes, he can and should charge it back on that basis. You generally have 180 days to charge it back, so as long as the charge was within this time frame, his bank should reimburse him. They'll try to suck the money out of TechShop's bank account, and if the money isn't in their account, their merchant provider will become another creditor in the bankruptcy proceeding for the total amount of chargebacks.