Manager Body Shaming

I am no longer buying at Mr Price at this point I just feel like burning everything I've purchased at the store. Yesterday I went to Mr Price in Randburg there was a Markdown Redsticker buy one get one free. I went to purchase 2 jeans and asked the lady who was packing if the deal was today as I had the red sticker jeans which I liked and she confirmed saying you correct and the lady at the fitting rooms also confirmed. Went to pay for the items when I got there the white store manager was there and he then said to the cashier for oversize there is no sale whereas the jeans I had, were on mark down and they had stickers to show and I explained to the lady that I asked 2 employees and they confirmed she just stared at me and said that's not possible.. Am so disappointed with that store at that time I am wearing things I purchased there just felt disgusted by the store and the manager to bodyshame women and am not even over size. Can I get someone to even cancel the application I did to have a store account.