McDonald's

I visited this mcdonalds after dropping my kids off at school. I orderd a carmel latte and the cup was only half full and when I brought to the managers attention all she did was tell me that it was what I paid for . When I go to different Mcdonalds and order the same thing the cup is full so I know how full it is suppose to be. I feel that she was unprofessonal and was very unhelpfull. I always told that the customer is alwasy right but not at this location. I feel that something needs to be done about making sure the customers are leaving satisfied.