Just Brakes coupon was not honored - Duluth, Georgia

I went to Just Brakes with a coupon for an oil change for $18.88.  They said that my car does not qualify because it is a "Honda."  My oil change would be $39.88 with a discount of $11.00.  Of course, that didn't include shop fees which I noticed after I left the place.  I've heard they add another $10 to the price.  Both men that worked that reeked of alcohol and cigarettes!  I think the one guy was missing most of his teeth.  When I first arrived, no one was in the office.  I had to walk all the way through the four stall garage and found this nasty guy sitting on his laptop.  He didn't notice me until I said, "H-e-l-l-o..."  After the other dude finally arrived from I'm sure his millionth cigarette/alcohol break, he gave me the pricing.  I told him to forget it... So glad I did after hearing all of these ripoff reports of that dirty, nasty so-called garage.  Thank god I didn't take it there for my brakes that need to be changed!!!  I almost did...  What a scam!!  How can these idiots keep ripping people off?