Complaint Review: doxon toyota of auburn wa.

 i took my car to the dealers shop because a check engine light came on i was charged 60 dlls  for the diagnosis  , they said it was a a faulty valve  so they said it will be a little more than 500 dlls to replace the valve , so i trusted them and i left my car there. they called me 3 days later to pick up my car , and said that it was fixed ,  so i picked up my car and a day later as i was driving it  the light came on again so i took it back to the shop , they checked and now they are saying it might be the timing belt and it will be 1500 dlls and they saying still not sure thats the problem . the light still on and the car still with the same problem (hesitates to start) i spent 560 dlls for nothing ? they  are just guessing whats wrong with my vehicle  so they make more money out of me i dont think this is fair i could leave the car to another mechanic , but i trusted them because is the toyota dealership ,