It is much worse if there is a dispute over a bill prior to paying.
I understand the repairer has more rights in that case. ie not letting the car leave the premises until full payment is provided!
Some mechanics rely on this to overcharge at the end of the job and add extra costs above an beyond what was quoted, hoping you wont dispute them because of the extra hassle. You should consider that the mechanic is relatively honest (or at least desperate for you job) in that they didnt automatically add 30% to the quote.
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