Tim Hortons review: customer service in re making change

I've gone through the drive thru the last 2 nights and ordered a small coffee $ 1.60. I handed the girl a toonie and a dime expecting 2 quarters in change.The first night I got back 1 quarter, 1 dime and 1 nickel. I just let it go. Tonight I ordered the same thing and gave the girl a toonie and a dime.Same result! I told her that I should have gotten 2 quarters $.50 not $.40 so I gave her back the dime and the nickle and she gave me 2 more quarters and closed the window.I knocked and she opened it and I gave her back 1 quarter and said she'd given me too much. The response?" what ever".I don't appreciate the attitude for me being honest.If these kids aren't learning remedial math in school I suggest they be taught on the job.A simple math test given with the job application wouldn't be a bad idea either.