Don't ever assume that because you pay the car mechanic hundreds of dollars the car is fixed...
Simply put: if the light is still on, you didn't fix the problem, even I can tell that! I want my moola back and don't worry, I called the shop in the afternoon and had the assurance that they would contact me back but have I heard from them yet? Of course not... why, why, why (me banging my head on the steering wheel for the 2nd time because yes, it's happened before with the same shop)...