The LA TECO may be closed. Employees may be working from home, or the office may only be open part of the week.
I was stranded in the US in late March and April. My Taiwanese wife contacted BOFA and learned about (what was then) the new special entry visa. I was in Texas and when I called Houston TECO I got no answer. Left a voicemail, but that evening I emailed the Houston and Chicago TECO offices with questions about the SEV.
I was surprised to get a phone call from Houston TECO the next morning. Found out that TECO had shut down all offices in the US except Washington, DC, and Houston. I would not have learned that easily if Houston hadn’t called me (might have taken 3-4 weeks).
I’d advise blasting an email addressed to all known TECO offices in the US. I think a lot of them have resumed office hours (at least in part), but you should get a response from the nearest TECO soon.