It only takes one rude employee to ruin a business. Walmart isn't going to be ruined from this but they will lose some customers.
I've never had an issue. Maybe she was having a bad day, many people take their bad day out on others
Even without a receipt, they should have been fine to give you a store credit if the item was still with the original packaging
As long as you had the original packaging you could of gotten a store credit on it. The cashier probably wasn't having a good day. Regardless if you had a bank statement that isn't a receipt
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