Costco review: customer/food service

Afternoon of 11/25/15. My mother and I get hot dogs in the cafe after some shopping. My mother unwraps hers to find the end of her hot dog is clearly bitten off. She goes back to ask for a new one, to which the girl rudely snatches it and takes it to someone in the back nearby. Whoever that girl spoke to audibly laughed, looked back at my mother, then said "haha she didn't buy it". The girl then gives my mother a new hot dog and doesn't bother apologizing or giving her money back. Management must realize that if my mother hadn't caught this, she could have gotten ill from whoever bit into her food before re-wrapping it. This is a sick joke and behavior like this should -never- be tolerated, as it is a clear health code violation. If this is the type of people this Costco hires to handle food, it may be safer to go elsewhere. Disgusting.