That's rediculous. I'd deny payment because they didn't get your authorization. Also, I'd ask for a break down as far as parts and how long the labor took for the oil change. Your lawyer could have a good time with these people. Make the service manager aware you have no intention of paying that and that you will have someone looking into those fees.
As far as an alternative to servicing your car, change your own oil. It will cost you approx $30 total for the oil and filter and should take you 30-40 minutes.
As far as an alternative to servicing your car, change your own oil. It will cost you approx $30 total for the oil and filter and should take you 30-40 minutes.