Urgent help needed. Facebook and Instagram suspended without any warning.

If its suspended its most probably gone, you wont get it back. And they will not give you the reason, support will be unreachable as well.

I’ve managed this situation for multiple clients, and the main problem is usually that everything is too tightly linked under a single Business Manager. To prevent similar issues down the line, it’s best to separate your assets—set up different Business Managers, domains, and payment methods wherever you can. Also make sure not to reuse the same domain, phone number, or email across accounts, since Meta tends to flag those connections quickly.
If your appeal is still under review, keep following up with support, but also prepare a backup setup in case it doesn’t get approved.