One Order - One Big Mess - One Terrible Attitude

We pulled in and were first in a non existing queue at a visibly quiet time of the morning. We placed a simple order: one Chicken Mc ****in breakfast and one Cappuccino with sugar added to the coffee before sealing. As we pulled up at the collection window, we were presented with a Cappuccino and sugar sachets - with no indication of willingness to correct the mistake (we heard the Order attendant specifying that sugar must be added before sealing). We were then asked for our receipt for we had to wait for them to prepare the Mc ****in breakfast . . . whilst waiting (still with clear indication of it being a very quiet morning) we decided to quickly add the sugar and stir before continuing our journey - only to discover that we were given Hot Chocolate instead of Coffee . . . when we approached the manager to rectify the mistake for us, the collection/ pick-up attendant adamantly exclaimed that we definitely ordered Hot Chocolate - he was extremely arrogant about it - we had to ask him to take the receipt out of his bin to prove our 'innocence'. We find this experience completely unfit for this establishment and should it not be rectified, we will surely discontinue our support.