After our order was rang up incorrectly (I am a vegetarian and ordered a sandwich w/ no meat), we communicated the inaccuracy to the associate at the second window, Asst Manager Michelle, who appeared extremely agitated upon our arrival. Rather than correcting the issue, Michelle argued w/ us about what we ordered. After the correction was made we pulled ahead to check our order. At that point we noticed the order was still incorrect. I went inside and requested Michelle, the assistant manager, specifically. After refusing to address me for several minutes, Michelle came to the front counter. Another associate was already fixing the sandwich but I had concerns with my receipt. Michelle then went to the back and kicked a bucket across the kitchen and yelled, "This is bullshit". She then returned with a different receipt and said we had been given the wrong one and that we had in fact not been mischarged. This was all done in an extremely argumentative tone. In summary, my order was incorrect, we were given the wrong receipt, and I was addressed in a very unprofessional manner. I do not expect 5star service at a fast food place; however, her language and demeanor were out of line.