The worst service by far

I got to the till the cashieqr was assisting the lady and made sure that she scanned all her items from the trolley without taking them out. Then another costumer come with a salesman and was assisted before me and even a simple explanation of which I didn't have a problem with it. When my turn eventually came the lady asked me to place all 13 items on the counter of which I refused seeing that the previous ladies items were scanned from the trolley and when I asked I was given the worst attitude and she made remarks to her colleague that they shouldn't assist customers seeing that the till was not for grocery and ask why didn't she tell the lady before me that ********.when I asked for the manage she said she doesn't know where she is and shake her head. Ask another salesman only to be referred to Mercia Fortuin who was only two meters from the till but the cashier looked around and said she can't see her. I did make the manager aware of the service and she did nothing and also made her aware that I'm going to complain