Maverik Adventure's First Stop

I am sort of pissed off. I went to maverick this morning just to get cash back and I decided to buy a couple things just so I support the company, instead of just going to the atm. I asked for 20 dollars cash back and was just about to ask for 5 ones and 3 fives when the attendant spits out no and shoves the 20 in my hand and says goodbye, and not even have a good day. When I think of customer service this is the opposite of what I think of and I am disappointed in the company right now. I expected more from such I wide known company. I know that there are plenty of great people at maverick but this person was just rude.