You are in the right place.

Take a breath. Call now, or send the form and we call you.

While you wait, three things.

Do not power off affected machines. Shutting down destroys memory evidence and can make ransomware worse. Leave them on.
Isolate, do not wipe. Disconnect affected systems from the network. Pull the cable or disable Wi-Fi. Do not reinstall, delete, or “clean” anything yet.
Preserve your logs. Firewall, VPN, email, and domain controller logs age out fast. Export them now if you can do so safely.