Hi and welcome to JA. I am Ray and will be the expert you tonight.
I would consider an EEOC complaint here claiming disparate treatment.It appears this may be age related and that they are treating you disparately, more harshly than say a younger person.Also they appear to have incorrect or incomplete facts they are basing this on.
Filing with EEOC protects you from being at will employee.Also if they retaliate you can file again with EEOC.This is really troubling that they appear to be treating you differently and more harshly.You may also consider a suit here against employer for such discrimination.
If a complaint against a business (or some other private employer) involves race, color, religion, sex (including pregnancy), national origin, disability or genetic information, the business is covered by the laws we enforce if it has 15 or more employees who worked for the employer for at least twenty calendar weeks (in this year or last).
EEOC will investigate here and you may also seek damages yourself in a civil suit for such actions by the employer.
I am so sorry you are having to go through this.I do hope you seek some justice.Filing with EEOC may prohibit them from more adverse action.I fear they are trying to run you off based on your age and discriminate here against you.
I appreciate the chance to help .Please let me know if you have more follow up.Thanks again.
I wish you a happy thanksgiving as well.
File with EEOC here.