Worst customer experience on Christmas day

I went to pick n pay on Xmas day and upon leaving the store I realized I was charged twice for a certain item. When I went back to the store to enquire why I was charged for 2 plain yog/double x6 when I only took 1,the rudest cashier Ntombi with dreadlocks said "they voided these item already , they might have voided an incorrect item" talking to herself, not explaining anything to me. I waited more that 10 minutes for her and her "manager" to fix their error and then they gave me my R1, 10 back as if nothing happened.Ntombi then took the plain yog/double x6 and put them aside. I looked at her and she was like" what? what am I staring at",i asked about my plain yog/double x6 and she was like she forgot about, them. I asked her how can she forget something she was assisting me with just now, she said what is she supposed to do since she forgot about them. I then said to her it means I was supposed to come back once again to the store. She rep**** by saying "none of this is my fault" she repeatedly told me these and when I asked for a manager she couldn't care less.What looked like a "supervisor " came and said she's "sorry" and I shouldn't be upset. She took my stuff out of the plastic and didn't put them back, stuff that I initially put in the plastic bag. Her service was beyond disgusting.she saw it fit to tell me whatever that was in her mind ruining my Xmas day. I hope she will be dealt with accordingly.