You probably need to delete the forms involved.
Delete the 8889 form and related forms. Do this by going to My Account (at the top), click on Tools, then on Delete a Form.
Delete any "Form 1099-SA" you see, as well as any "Form 8889-T" and "Form 8889-S".
Make sure that you do not have a code "W" in box 12 on your W-2, because that tells TurboTax that you do have an HSA. If you believe that you don't have an HSA and the code "W" is there in box 12, you need to have a talk with your employer.