Taco Bell complaint: Manager Nasty and Advertisement is wrong

My 8 yr old son came in to order food from this location, plastered all over the screens are the nacho fries, he was advised that the promotion ended, ( which on the screens nothing states promotion nor is there a sign that states this store no longer has this item), when asked for the GMs or Regional Managers name and number Halle proceeds to get the Assistant Garrett who is extremely unprofessional and rude we asked for the general managers contact name and info he advised I had to call corporate, my family has been in the restaurant industry for 20 plus yrs, if someone asks for your GM you give your managers info instead he proceeded to take off his headphones as if he were going to try and fight my husband while we clearly stated what our complaint about has nothing to do with him or anyone in the store. We simply wanted to GM and Regional information regarding the advertisement in the store. Garrett then also proceeded to say we had to call corporate again, we asked for the number he wouldn’t give the information, i asked for my receipt for my sons food who just ordered and he wouldn’t give that, I have never seen such unprofessionalism in my life, I proceeded to tell my son we didn’t even want the order and give him back the food that is the only time when he wanted to provide me with a receipt. A manager should not be trying to argue with a customer because they asked for a higher ups contact information regarding a complaint or even something out of that managers hands , I will never return to the store and this seems to happen at alot of these taco bell locations.