Bad Service fly though

I am baffled and I need to understand this, I went through the flay through this weekend and placed a order and when I went to the next window I needed to change my order and I was told I need go through the flay though again to order again and queue again if I need to change my order when I originally waited in the queue and I needed to go back through and queue again. Now in this day age how is it that my order could not just be changed at the payment window, are the systems that backward??? I then decided to rather just park off and go into the chicken licken and was served by wiseman who tried to explain there stupid system to us which still did not make sense as he was just covering for the lady that did not want to assist us for for whatever reason. then to make matters worse our order was not that difficult but for some reason we only got our order after 7 people got theirs before us . I think the staff there are extremely unhappy for some reason and we get the bad service in return. something needs to be done here we cant continue with this bad service

what type of service is this and who manages this and who thought of this and why cant you guys think of ways to make it easy for the customer instead of causing frustrations.