If you do, you're in good company. Unfortunately these happen all the time. Much of the time the errors are minor or non-consequential, but when a serious error does occur the basic way to address it is this.
Write a letter demanding Experian, Trans Union or Equifax, whichever agency is reporting it incorrectly, remove the error. Send any proof you have, a copy of the receipt showing the account paid, is not yours or whatever the case may be. Keep copies and records of when you send the letter. The Fair Credit Reporting Act requires that any errors you report should either be verified as accurate or removed by the reporting error within 30 days.
Now, this may not happen in 30 days, so follow up and verify that it's done or resend the letter. You can also use a company through your lender called RapidRescore. They charge a fee, but will get the issue resolved in days rather than weeks and last I knew, only charge if they are successful.