Update: The owner of Sadie's contacted me via Facebook. He was very nice and apologized for my experience. He let me know that the staff member was wrong regarding the Groupon terms, and was very nice about everything, including inviting me back for another meal.
I have not been back to Sadie's yet, I will write another follow up when I am able to make it back. I took way too long to post this update, and apologize to Sadie's for that, I was hoping to get back to include my updated experience.
I've updated my Star rating to a 3/5 because the owner was very good with addressing my concerns.