I wrote a check and the person I gave it to increased the amount of the check before cashing it. The bank/credit union paid the higher amount rather than the amount I had written. What can I do?

You are still responsible for the original amount of the check.

If the check was processed as an electronic transfer, you have additional protections under federal law.

If the check was not processed as an electronic transfer, you still may have protections under state law.