Try sending an SOS message through LinkedIn. You can add up to 300 characters in your invite.
Also you can call them. There was a case 4 months ago with me where I had to reach out to a secretary (person who answered the phone) and tell her very calmly to put me through to the CEO and that no I wasn’t trying to sell anything.
Looking back on it I could have just had her take down a message, that works too...
Also thanks for trying to reach out despite such difficult. Hopefully in a few years there will be a law that every registered website, or say every LLC that meets XYZ criteria has to have a cyber person on file with the state. There could be firms that have cyber ppl and you could pay them $300/month to register with them to use one of their agents.