Mr Price - Assisting

Today 30th of August 2021, I went in Mr Price 429 CT to look for markdowns items. I got more items, I went to pay to the till and nicely asked the cashier to scan for me some of the items to if is not cheaper than the price on the tags because I normally do that, the lady start to shout and confusing me like hell. I'm very disappointed because is not my first day to purchase from Mr Price. To honest I feel so embarrassed in front of other customers and her colleagues. And I don't know what was my fault. She tells me I bore her early in the morning I make her day bore.