dont know customer service

I was at the store last week Wednesday,Cashier gave me a closed sign to put on my trolley out of nowhere the supervisor or **** know what she is said i mut move to a other queue as she needs to cashup . Very unhelpful and bad attutide i will let all my family and friends knwo of my experience.She then when i did not move she started taking my stuff off the counter and placing it in my trolley and moved me ... Something must be done