I bought a meal and added a cold drink to it but when she gave me my order she never gave me the drink as soon as I noticed I went back to ask for it and found a different lady she told me she couldn't assist or even contact the other one to confirm if sh

I bought a meal and added a cold drink to it but when she gave me my order she never gave me the drink as soon as I noticed I went back to ask for it and found a different lady she told me she couldn't assist or even contact the other one to confirm if she really didn't give me a drink they have .I was so agitated because how can they not know how to come to terms with their customers