Pedros pavilion always out of stock

Everytime I order pedros via the mr d app or Uber and I request for Coke Zero , without consulting with me they send me a full sugar coke which is totally flat. I called the store manager to complain and he couldn’t give me an answ. What sort of business do you ran where you ran out of items??do u guys not cater for diabetics and fitness people? Please catch a wake up . We are not living In the 80s. Please want to be healthy