Repeated Poor Quality & No Response from Store after email

I am very disappointed with the service and product quality at this McDonald’s retail crossing branch On 6 February, I purchased two McFizz Passion Fruit drinks with 2 meals (I still have the receipt). Unfortunately, both drinks tasted like plain carbonated soda water with little to no passion fruit flavour. The taste was completely inconsistent with the usual standard I expect. What is even more frustrating is that this is not the first time this has happened at this branch. I previously experienced a similar issue and raised it, but received no feedback. After this recent incident, I again emailed them and have still not received any response. As a paying customer, it is disappointing to repeatedly experience the same quality issue and then be ignored when reporting it. I was also unable to return to the store on the same day, which made the situation even more frustrating.