Mc Donald, Miss-selling.

What they write on the notice board when one orders and what you pay for is 2 different things. I ordered a big mac meal, which was said to be R39. 90. When I had to pay R2 was added, my question is why advertise one price and charge another. Yesterday I ordered a happy meal for my daughter, on the notice board it said happy meal cheese burger R36. 00 when I got to pay I paid R40. 90, my question to the cashier was why the difference in prices she told me it was for the juice, I then asked so a happy meal is R36. 00 without juice and R40. 90 with juice, then that is not a meal that is miss selling.