I had my car in for an entire day 11/22/17, for an...

I had my car in for an entire day 11/22/17, for an oil change, tire rotation, and because the 'check engine' light was on. I was told that if the 'check engine' light was due to a warranty issue, there would be no charge, and if not a warranty issue, Doug would call and discuss the fix with my husband. Never received a call all day. I had to call at the end of the day because I needed my car back. I was told it was completed, and that the 'check engine light' showed no issues. When I picked up my vehicle and paid the bill, I was charged $61.00 for MedVed to run the diagnostic on the 'check engine' light. I was surprised and disappointed that I was charged for this, but was told that it had been cut in half. Very disappointing to not have been warned that there would even be a charge to diagnose, so that I could have decided whether or not to have MedVed even look at it. When Doug said a warranty fix would be no charge, I understood it to mean the diagnostics were are no charge. I could have gotten the same diagnosis elsewhere for much less. Then to top it off, on 11/30/17, the 'check engine' light came on again! So obviously, there is still an issue! I called late on 11/30/17 and left a voice mail for Doug to return my call, and no call returned on 12/1 or 12/2. This is not the first time I have called and left a message, and received no call back. Very poor customer service! My plan was to stick with dealer service for my Cadillac, but thinking I may just go to a private mechanic from this point forward.