We dropped my car off at the service center and sp...

We dropped my car off at the service center and spoke with someone there about the problems we were experiencing (car wouldn't always start, infotainment system periodically malfunctioned/shut off). He explained that from the description, it was very likely related to a service bulletin about a loose negative battery cable and said they'd take a look at the cable in my car. He then stated that only if that did NOT fix the problems we were having, he would have to run a full diagnostic test on the vehicle to determine what the problem really was, for which the charge was roughly $150/hour. We agreed and left the car over night. However, when we went to pick the car up the next day, we were told that they did an hour of diagnostic testing BEFORE checking the cable, and that we would have to pay $150 for an hour of testing. To top it off, the testing yielded no results. The only "fix" made to the car was tightening the battery cable. And when we asked if the testing had at least confirmed that the cable was indeed the problem, we were told that they didn't actually know what the problem was but that the cable MIGHT fix it. Very disappointed that they decided to do the opposite of what I was told and did $150 worth of diagnostics BEFORE fixing the problem I asked them to fix. And now I'm driving a car that may or may not be repaired. I've been coming to this service center for 3+ years, but I will not be coming back.