How would I go about getting in touch with the owner or corporate office because I was put under the impression that I was over night supervisor but when I got paid my pay hadn't changed and then when I started asking questions they tried to fire me

If you have nothing in writing to verify this, unfortunately, there is nothing you can do. Nessa, I am sure you are a good person and a hard worker, but you must remember to always get agreements in writing and signed by both parties. This secures your position and gives you leverage. I day this as an outsider and someone who has been in your shoes. Stay calm, stay focused. Listen and learn. A friend.

Call them