What do I do if a manager accused me of shoplifting and probable cause?

I was shopping at a department store and bought some things. I decided to buy some other things. I asked the store employee if I could look for my daughter who was going to meet me. I told her I was still at the department store and I told the department store lady I had their cart with my bags and some other stuff. I was just going to look out into the hall for my daughter. I crossed the store line in the mall to look for her. I was arrested even though I tried to tell them I was looking for my daughter and the lady at the door knew what I was doing.