Isn't it FALSE ADVERTI*****T???

I'm not sure if I'm wrong but isn't it false adverti*****t. The menu on the drive thru say big mac meal R39. 90. It shows a burger chips and coca cola. The they say that you have to pay R2 extra if you want coke. The price is only for coke zero. How is that possible. The picture of the cool drink isn't a coke zero its for coca cola. I know its only R2. But right around SA for each extra R2 it is good money. If I'm wrong I'm wrong but I can't see in the small print that it is indicated somewhere.