Disgusting

Me and my girl ordered our pizza she has her pizza with the gluten free base and mine is a normal base, so the pizza came to the table only to find that the base is not a gluten free base. No problem the waiter handled it a manager came and ask if everything was ok so I said no and explained the nature of the problem but told him that it was dealt with. the as we were sitting there I saw the manager at the kitchen station talking to the staff and wow they just took the toppings of the old pizza and put it onto the new pizza cold like that onto a warm base who does that according to all the places I worked at you do not do that and in full view of the customer. not ok. Bottom line is that place is disgusting if they can do that what else do they do.