Called twice to book a service and the two times t...

Called twice to book a service and the two times the reservation was not there, called to get the price for an oil change was quoted $99, at the service center first time i was asked to pay $120 and the second time $135, the difference is not big, but it appears as if they charge whatever they want for the same service. Would love if they would act like a BMW shop and not a backyard garage. Just horrible service thus far!