Bad attitude at Engen garage Midnight motors

On the 24/03/2016 I was passing the Bethal Engen Garge Midnight motors in Mpumalanga, my pregnant wife was feeling to drink a TAB so I stopped to buy her a can and some chocolate. After paying for the stuff I asked the cashier for a straw as we do not drink from the top of the can due to germs and the fact that she is pregnant we are more careful regarding hygiene. The cashier said they don't have straws, I asked to see the manager/supervisor no one came, after waiting awhile I went to the office myself and pressed the button for to get someone's attention, Then the manager and owner came out the guy was very cool and said he will see if he can make a plan. The lady was very rude saying that if coke doesn't give her the straws what must she do ? so I told her like I'm asking her so she must also ask them. She kept clicking her tongue at me while I was talking which only made me more upset. I then told her that she is rude, she said this is her store and she is the owner. She asked me to leave the stuff and that the cashier to refund me. I also will not fill my fleet of 30 vehicles at this service station. I tried explaining her the shop experience and forecourt is seen as an whole