cannot buy a bag to replace a broken one?

I have such a high opinion of shoprite in durbanville, that I was completely shocked at shoprites u save branch on Belville station, I had bought some items at durbanville shoprite and other stores I had one carrier bag with my groceries in, on the way to belville station my bag had broken on the way, and I decided to stop at <br> the usave to purchase a new one or 2 actually. ...well let it be known, this is not possible! When I stood in the queue first a man pushed through the line to get out of the store, pinning me hard against the checkout counter with his body, when I protested he said sorry and kept pushing, this of course while a security guard was standing right next to the check out, not moving, this made me a little disgusted already, when it was my turn at the checkout, I asked to buy 2 bags to replace the one that broke, the cashier stared at me and asked me what I'm gonna buy, I repeated 2 bags please as my one has broken. She said she can't sell me the bags it's against policy, after attempting to explain again, the security guard then moved closer to the checkout, Uhm hello? All I could think was, what the ##$$. I left the store fuming! Thanks shoprite :)