I was trying to fuel at pump 10, but it says that I must pay before fuel, so I went into the store to pay for it. When it was my turn, I said to cashier " pump#10, n0. 91 gasoline, 45 dollars please. " The cashier said " We don't have $45, we only have $48". And I said " Ok, $48 is good." I paid and went out to fuel. But when I tried to fuel, the screen shown that I didn't pay, then I checked my receipt, and I noticed that the cashier made me pay for pump6. After that, I went into the store again, and I said to cashier "Hi, sorry, l said pump 10, not pump 6." The cashier said " Pump 10 needs prepay." And I said "I know, I wanted to prepay, and that's why I said I want to pay $45." What happened next surprised me. He yelled at me" You stay there! And Don't shout here! Don't shout!" I was shocked! I didn't shout! And I wasn't even angry before he yelled at me. After a long while wait, he gave me $2 back. But the fact is that he charged me $47.36, the amount I should pay is $45, where is the remaining 36cents??? He didn't return the right amount I should get to me. So I want to complain 2 things about the cashier. The first is that he is serving customers with very, very bad attitude, which makes me feel really unsatisfied. And the second thing is that the cashier didn't refund me the right amount. I want the refund, and please train the employees to be polite. This happened at 380 Main St N, Markham, ON L3P1Z4 around 5:48 pm on May 14.