Tim Hortons

I get to the drive through waited a few minutes nothing happening 3 cars behind me, I said hello hello no answer, guy behind me tells me to go to the window .i get to the window the employee starts giving me crap and tells me they're only 3 employees i told him all you had to do is say one minute or something .how do I know if it's working or not .I left with nothing after wasting at least 5 to 10 minutes of my time .close the drive through if you can't keep up .in not looking to get anything.