Walmart Sales Associate/Cashier interview questions

I received a phone call a day after I applied and scheduled to meet the next day. The Walmart was very disorganized and messy. I had to wait 15 minutes until someone finally acknowledged me waiting in the Pickup area (the area the lady on the phone told me to wait) and then I was interviewed. After I left, I received a call where the lady stated that they didn't realize I was a minor (even though I mentioned that I'm in high school so that should have been a sign?) and that I had to come back again. Went back two days later and the lady seemed like she forgot I was coming. She then asked where my birth certificate was (which she never told me to bring) and said I would have to come back again.