Aibu to want urgent adv

[Urgentadv]

There are probably at least 5 AIBUs here, but actually posting for traffic.

Ex and I have a business.
We are just about to draw down a commercial mortgage.
I have noticed some missing funds.
I have written to him to demand we both have oversight and can't transfer without both signatures. He won't engage.

I thought, fine, I won't sign until it's settled. The drawdown form has just arrived and it only requires one director's signature.
Help, wtf can I do?

Sign it and take control of the funds immediately before he does, then work out what happened to the missing money.

Call the bank and say it must be two.