Easiest is to simply use the "Provide Feedback" form. One of the options is "Request Refund". Simply complete the form, take a screenshot and save that.

F9 then has 7 days in which to initiate a refund. On the 8th day, file both a chargeback and a DOT complaint. Include the following with both:
1. Copy of your e-ticket receipt.
2. Notice of time-change or schedule showing the change.
3. Screenshot of your refund request
4. Any response or the fact that there has been no response.

If you package it all this way, you should see a temporary credit in a day or two and that will become permanent soon enough.

No reason to wait or to spend time & effort tracking this stuff down.