Appliance Repairman

Quick Google search brought these guys up, they advised that I would have an $80 charge to show up and assess the fridge (wasn't cooling properly). They guy looks at it for 45 seconds and tells me it will be $360 to fix for parts and labour. I ask how long it will take - he says 90 minutes. So in half that time he's done and didn't replace any parts. A) How can a guy assess something in 45 seconds and be so incorrect in his time? B) How does a time and materials charge not get reduced when there were no materials used and the time was 1/2 the estimate? This is just wrong.