The shop charged more than the estimate

You dropped the car off, got a number, and the invoice at pickup is higher — sometimes a little, sometimes a lot. Now the shop won't hand back the keys until you pay the full amount.

This is one of the more workable disputes, because it usually comes down to a document: what did the estimate say, and what did you agree to?

What the paperwork has to show

The strongest version of this case is simple. There is a written estimate with a number on it, you never approved anything above that number, and the final bill is higher anyway.

Many states require a shop to get your approval before going past the estimate by more than a set margin, and to keep a record of that approval — a signature, a note of the call, a text. The exact margin and the exact rule vary by state, so the question isn't "are they allowed to charge more" in the abstract. It's whether this shop followed its state's process for going over, and whether it can prove you said yes.

Authorization is the whole fight

If the shop called, you approved the extra work, and now you have sticker shock — that's a weaker position. Approval by phone usually counts, even without a signature.

If the shop never called, or called and left a message you never returned, or did the work first and told you after — that's the case. Undocumented approval is the shop's problem to prove, not yours to disprove.

The car as leverage

A shop that did the repair often has a lien on the vehicle until the bill is paid, which is why the keys feel like a hostage. Paying under protest to get the car back does not waive your right to dispute the overage afterward — but say so in writing when you pay, and keep that note.

Do you actually have a case?

You're probably in good shape if: there is a written estimate, the final bill exceeds it by a real margin, and the shop can't point to any approval for the difference.

You may not have much if: you signed an open-ended authorization, or you approved the extra work when they called, or the estimate itself said the total could move and the overage is small and explainable.

What happens next

Gather the estimate, the final invoice, and any texts or call logs. Write the shop a short demand: the estimate said X, you were billed Y, you never authorized the difference, and you want Y minus X back. If that goes nowhere, small claims is the usual next step.

Wherewithal is an organizational tool for putting that together — not a law firm, and not legal advice.