NON-WORKING APP. NON-WORKING MANAGER

I placed an online order with Debonairs Pizza Edenglen this morning (28/07/2017),I swapped pineapple for feta cheese, and my subtotal on the app was R50-80. HOWEVER when my food arrived they charged me R60-70 . I did not notice this immediately as I was very busy when my food arrived. Upon enquiring about the problem the manager said that she will look into it and get back to me. When I phoned them an hour and a half later,she has a no-care attitude,was extremely rude,and asks me what I expect her to do about the issue. She has absolutely no regard for customers and horrible customer care! 10/10 would NOT recommend Debonairs Pizza Edenglen because of their manager!