Mcdonalds Westgate - Putrid and rotten Contents in Coffee Box

I ordered a coffee box from your westgate branch in johannesburg. The order was delivered by ubereats (Cliff Austins). I received the box with the tap not exposed as expected so I had to open the box to access the tap. Upon opening the box I noticed the contents were less than expected and the valve had residue on it from apparent previous use. I opened the valve and was met with an extreme putrid smell. The contents of the bag were found to completely putrid and rotten with an unbearable smell. THIS POSES AN EXTREME SAFETY RISK TO CUSTOMERS. I have retained the coffee box and will report further to sanitary authority. This has unfortunately become expected from service establishments but risking customers safety is unfortunately not something that can be taken lightly.