You asked for an oil change and a brake inspection. You got a bill for control arms, a coolant flush, and a serpentine belt. Nobody called. Or someone called, you said "let me think about it," and the work was already done when you arrived.
Work you didn't approve is a different dispute from work that cost more than expected. Here the question isn't the price — it's consent.
Most states expect a shop to get your approval for repairs before doing them, and to be able to show what you approved: a signed estimate, an initialed line, a logged phone call with a time and a number. Approval for a specific list of work is not blanket permission to fix whatever the shop finds.
What counts as valid authorization, and what a shop owes you if it skips that step, varies by state. The common thread is that the shop carries the burden of proving you said yes — you don't carry the burden of proving you didn't.
"You signed the work order." A work order authorizing a diagnosis, or a specific repair, isn't authorization for everything done afterward. Read what the signature was actually next to.
"We told you on the phone." If they can't produce a call log or a note, that's a weak claim. If you did approve it on the phone and now regret it, that's a different and harder situation.
"It needed to be done." Whether a repair was genuinely necessary doesn't decide whether the shop was allowed to do it without asking.
The original work order or estimate, showing what you actually approved. Any texts or emails. The final invoice, showing what they billed. If the unauthorized part is a safety item the shop claims it had to address, a second shop's opinion on whether that was true still helps.
You may not have much if: you signed an authorization that listed the work, or approved it when they called, or told them to do whatever the car needs — that last phrase, if they can show you said it, is a problem.
Write the shop: you authorized A, they performed and billed B, and you want the charge for the unauthorized work removed or refunded. Keep it specific. If they refuse, small claims is the usual next step.
Wherewithal is an organizational tool for building that file. Not a law firm, not legal advice.
Wherewithal is an organizational tool only. Not legal advice. Consider consulting a licensed attorney.