Burger King

My dad went to the Burger King on 825 East Main Street In Meriden and ordered 3 whopper meals he was charged around $31 But the cashier only gave him two whopper meals and told him he did not ordered 3. In order for my dad to get the third meal he had to extra $10.00. The cashier did not provide receipts and was extremely rude. I would like to get a receipt if his transactions.