McDavid Nissan Service scam Houston Texas

I took my car to McDavid Nissan dealership for service engine light.  After having my car for more than 6 hours, the service advisor called me with a list of needed repairs.  I was e-mailed a copy of the needed repairs and cost of those repairs.  I noticed a few items were overly priced and decided to go with the needed reaairs to fix the initial problem.  The repair cost was suppose to be 383.00 over the phone.  I gave permission to do the repairs but when I got to the dealership service department, I was given another price, now 425.00 with taxes added.  After paying that amount and on the way home, the service engine light came back on.  I took my car back to the service department the next morning.  I had to leave my car again.  Approximately 1 hour later, the service advisor called and said there is a small leak that needs to be repaired but would require additional charges.  I informed the service advisor that I have already paid them to fix this problem, which clearly they did not do the first time.  I request they fix the initial problem, the one I have already paid to have repaired.  Needless to say, they wanted more money and I refused to agree to that, so I was given my car back, still with the original problem "Service Engine Light" still on.  Bad business.  I checked McDavid web page, no place on their web page for Customer Complaints.