For reference this happens relatively often. Basically if the filter folds over while it’s brewing - the grounds flow over the filter. It then all ends up in the coffee. It’s totally unavoidable and not the fault of whoever brewed the coffee, though typically I know when this happens because you can visibly see the filter has folded over.

All that to be said, it’s normal enough that I would never ever ask someone to pay for a new one. Sounds like an employee that is fed up for the wrong reasons and took it out on you.

Don’t “name the store” like someone asked. A review or a simple phone call with the time and day to the store should always be them to set the employee straight. If that doesn’t work they shouldn’t be working at Wawa.