Dairy Queen Grill & Chill

I have visited this dairy queen many times in the past 16 +years I had a very strange thing happen at the drive thru...after ordering 2 cho med shakes for my grandsons,I was told the cast was 6.34 I took out my money to pay while waiting for cars in front of me. since I had a lot of ones in my wallet ( but not 6) I gave the older lady a 10.00 and a 1.00 plus .35 so I would get a 5.00 bill for change. I even spread out the 10 and the 1 not to confuse her when I handed it to her.she then handed me back 4.01 and said this is your change...I said no I gave uoy a 10. and a one so I could have a 5.00 She was very nasty and said I don't have that in the drawer and called someone over and then handed me a 5.00....she tried to make me feel I cheated her out of a dollar...I find it very disturbing to pay someone who does not know how to make change