Moss Bros. Chrysler Dodge Jeep Ram Moreno Valley They posted a deceptive coupon for check engine light diagnoses on their website Moreno Valley California

I found a coupon for a check engine light diagnoses (129.95 value now free) on their website so I took my truck to them 12/17/2015. When I arrived about 8:00am, the service advisor told me the coupon is just to pull the code from the computer (30 seconds). We debated for a few minutes because that’s not what the coupon says and I don't need to know the code, I already know it (truck has a built in code reader). I need them to figure out what's causing it and give me a price to fix it. So I ask what it costs to find what's causing it and he points to the coupon and says it’s the $130 that's crossed out. After a few more minutes debating the verbiage of the coupon, I leave the truck hoping he's mistaken as to what the coupon is for and the technician will figure it out. After having it all day the advisor calls me at 4:20pm and tells me the code number and 3 different things the book of codes say could be causing it (which again I already know) but it will be $130 to figure it out for sure and they have to keep the truck another day because they won’t start on it until morning. So I tell him go ahead and figure it out. About 5:00pm the same day I show up at the facility and tell him I changed my mind I just want my truck back. He says the technician went home and the wheel is off so you can’t have it until tomorrow. The next day 12/18/2015 I called and left a message for the service manager Fred Benoit at 7:30am to call me back and of course he never has. I also called numerous service advisors at different Moss Bros. locations that take the same coupon to ask about the coupon verbiage and they all told me it’s only to pull the code (again despite what the coupon says). So I ask them all how much to pull the code without the coupon and they all said a code pull is always free it’s the diagnoses of the cause that's $130 but the coupon isn't for that despite the verbiage of the coupon. So now, how is the coupon a $130 value if a code pull is always free and why doesn't the coupon say it’s only to pull the code?