Drive Thru - Glass Bottle pierces tyre's

After placing our order we proceeded to pay. Little did we know that our order would cost us over R5000.00.<br> Our tyre exploded. Upon investigation we discovered that a glass bottle pierced the Tyre. The manager ran outside to tell us that he is sorry but a customer through the bottle there. My question, if you saw the customer throwing the glass bottle on your drive thru, why did you not pick it up before a customer drove over it. The manager then decided to become arrogant and tell us its not MacDonalds fault. My dad is 60 years old, it was freezing outside but the manager found it more important to tell us its not their fault instead of offering us assistance. It was very cold and i had my two young kids with me. I had to get a family member to fetch us while my dad and husband tried to resolve the tyre issue. We were heading to Drakensburg and the entire trip had to be cancelled as we could not get a spare tyre. I would have expected the manager and staff at MacDonalds to be a little courteous and offer us some assistance instead of being lectured that its not their fault.