Dairy Queen locations in Missoula, MT

We went to the drive through on the Brooks Street Dairy Queen before closing at 9:30. We were there in a long line and before we could even order they turned the light off and told everyone in line that they were closed. If you are aware of how the drive through is on that location, you cannot just leave the line, you either have to back up (which is what we had to do after the people in back of us backed up) or wait till they serve the people in front of you. It is beyond understanding why they have to do things this way. If you are closing and you don't want to serve more cars, go out and put a sandwich sign after the last car and serve those who are in line before closing. Customer service should be priority, and this is definitely not a good example.