Resigned to 682.348.3213now job abandonment

I'm so irritated right now. I just quit my job on Monday in email to hr at midnight with documented evidence attachments of the harassment hostile work environment and bullying retaliation examples of why I quit. I work at a clinic so I also emailed cc the cdc and the people who fund our grant as well as I mentioned my clinic misusing and abusing the funds given to them by the cdc in my resignation email. Also to have them as witnesses to my resignation email. Tell me why I get an email from the company today saying I didn't show up yesterday for work or today and it's considered job abandonment since I didn't let my supervisor know and that HR will be reaching out to me by email for offboarding ? Excuse me? I've never had a job reach out to me after I quit and although its a bad company this looks sketchy. I forwarded the resignation email over again and informed them we are officially done and I don't need offboarding! Besides i have a new job. Has anything like this happened to anyone before? Super weird. Yes this job has a turnover