Sonic Drive-In

I worked at sonic for 4 days, this was my first job. My second day there I had someone physically touched me and rip my headset off of me as I was taking orders and they had no kind of verbal warning or any consequence for their actions. I don't think that is right in any way, and because of that charges will be filed and multiple complaints. Also the fourth day I worked their I witnessed a girl named Megan bad mouthing and cussing about customers as she was taking their orders, she would also scream through out the place as people were at the window getting their food, and also she screamed in my face and cussed at me because I gave the person taking over my shift my headset and she continued to curse at me, because it was my time to clock off and she proceeded to try and have me take orders when I hadn't been trained and then threatened to take my phone that wasn't even in use. I would like to make seperate complaints for both of the girls, as well as the restaurant itself, and the managers for doing absolutely nothing and I would like to know how to do so, thank you.