Step-by-step: if you think you were overcharged

1. Compare invoice to estimate

   Mark every line that is new or higher than what you approved.

2. Ask for an explanation

   Call the company and ask them to explain each extra line, and write down what they say.

3. Ask for a correction in writing

   Send a short email or letter with the approved estimate, the invoice and what you want changed.

4. Get a second opinion

   Another company may be able to tell you if a part was truly needed or was really replaced.

5. Use outside help

   Contact your state licensing board or consumer protection office, or dispute a credit card charge if appropriate.