McDonald's

I went through the drive thru with my dad this morning after being at the emergency room all morning for pneumonia. I'd been there all morning, had no money and was hungry. So I had cashed in my free happy meal as I had no money and plenty of rewards saved up on my McDonald's app. The guy kept telling me it was $4.05 which made no sense and I didn't understand his frustration till we got the receipt and they ended up giving us an extra six piece for free and a large coke. All we ordered was the single happy meal that was supposed to be through rewards. We get to the second window and my dad asked if he could just add a drink and he would've been fine with the manager just saying no but instead she ended up accusing us of just trying to get a bunch of free stuff. She gave us the extra stuff. We didn't ask for it and tried to correct it. She got upset with us for him messing up and I don't think he was understanding because he was new and she did apologize but she was really rude. I didn't get her name but she was a short Mexican lady. I worked at McDonald's as a teenager and I know that behavior was completely unnecessary. She could've been overwhelmed but her attack on customers was wrong.