If an employee of the store quotes you a different price than the label on the shelf or item, you owe the store zero responsibility.
Retail stores change pricing on products and fail to update pricing on the shelf all the time. Home Depot, Walmart, etc have interactions like what OP described occur every day.
The responsibility rests with the corporation to train and reward employee behavior.
If the company has chosen to staff their store with someone that doesn't give a fuck (underpaid, poorly treated, mismanaged, improperly trained, not well rested, etc), then that is a gamble they chose to take, and the last thing I am going to do is rock their boat when they built and arranged it this way.
Retail stores change pricing on products and fail to update pricing on the shelf all the time. Home Depot, Walmart, etc have interactions like what OP described occur every day.
The responsibility rests with the corporation to train and reward employee behavior.
If the company has chosen to staff their store with someone that doesn't give a fuck (underpaid, poorly treated, mismanaged, improperly trained, not well rested, etc), then that is a gamble they chose to take, and the last thing I am going to do is rock their boat when they built and arranged it this way.