oil change

I called requesting the cost of a synthetic oil change for a 2010 Camaro. An Asian man hastily quotes $68.95 and states there's no wait and to come now. So I do. Within 10 minutes of dropping my car off, he says I have a different kind of oil filter and says add $10 more. I reluctantly agree but frustrated that I have to pay more. 20 minutes later he says my car took an extra quart of oil and to add another $10. What am I supposed to do at this point. I say OK but expressed my great disappointment considering I called specified my vehicle and he quoted a price. He claims he didn't know. I called his bluff. The Asian guy (says Oscar on his shirt) has worked there for 10 years plus. He knows cars and knows exactly what it takes for a 2010 Camaro. I walked out of there having paid $95 for an oil change. I know synthetic oil changes cost more, but that is out of control. I WILL NOT RETURN TO RAY'S INSTA-TUNE AGAIN. YOU BURNED A LOCAL CUSTOMER. Oscar pointed out to me I'm not paying anymore than anyone else, so I wouldn't think he was gouging me. That's not the point. I called requesting a quote, made it clear what car I have and he used the ploy of "yea yea $68.95, you come now, bay open, no wait" knowing what my car takes and would increase the costs once he got my car in the shop. That's bad business.