Worst service ever

Went to mug and bean at Jean crossings today. Waited approximately 20min for our first cup of bottomless coffee. When we wanted a refill the waitress was no were to be found. Once she actually came after another waiter had go fetch her, she brought me house blend coffee. I specifically asked for decaf as I can’t drink caffeine. When I asked her if it is decaf she said it was. I told her that it was not decaf as I saw her pour it from the house blend. She then informed me that the decaf coffee is mixed with the house blend. I proceeded to ask for the manager. He could not explain way these coffees are mixed and said he will get decaf from the kitchen. The waitess then proceeded to bring me the wrong meal, I told her I did not order that I ordered a burger like I always do. She argued with me even though the person I was with heard me order the burger. This was the worst service we ever got.