Burger King

I wanted to share our experience that we had this evening after visiting the drive through of one your Burger King, we placed our order and the person taking the order was very friendly and when we got to the window we decided before she ran our debit card to add an order of onion rings to our order and the drive through person stated that we could not add anything to the order at the window that we would need to go back around and order at the menus' speaker, needless to say Burger King is losing business for this ridiculous rule and when asked why is that a rule she could not tell me she just knew that was the rule. I just feel like with business closing left and right this should be a rule that changes.