Walmart complaint: Discrimination and unfair and disrespectful

On the 31st of August I had to find a ride to get groceries for my 76 yr old mother and it was the last day to use her card or she would of lost out on 75.00.. I got to Walmart @ 10:38pm and I already knew exactly what to buy so I rushed through the store.. while I was there I grabbed (2) items,bottle of detergent and a box of softener that I needed to pay separately… when I went to cash out I had to use the self serve service…The lady that was a Walmart worker helped me check out and while this was going on, there was another worker walking around telling everyone it’s time to go it is now 11:00pm. I was already done with my mothers order but now I have to use a different card to purchase only 2 items with my Walmart card… The Walmart worker came to my register area and put a key in it and turned it and at the same time she was shaking her head “NO” and told me to come back tomorrow to buy the rest(2) items? I turned around and said , “Mam I am not done ? The lady who is helping knows I have to pay for my detergent and softener? And the other worker insisted that I couldn’t buy it now and to come back tomorrow..so I asked to speak to a supervisor and she wouldn’t get one so I said she was unfair because there’s other people still checking out? So I looked at her name tag and I told her she was treating me unfairly and I’m reporting her to the BBB.. I felt so disrespected and embarrassed and my Aniexty level was so high and I felt discriminated by my rights over (2) more items I had left to check out…. I havnt been able to concentrate since that day because I was not Happy at all and I was degraded And I got no support from the girl at all:.. So I got her , it said , Tara . And I told her that if I was one of her family members I bet you she would let me get the rest of my items… And she was so sarcastic and kepted shaking her head and telling me that I’m am just gonna have to come back and I told her I wouldn’t be able to because I need to find a way there…