If a company doesn't respond to this it tells you they likely only respond to lawsuits. As a paying customer whose business operations are impacted, you should have standing to sue. Your company could potentially extract from Zoom the entirety of the money that their dumb decision made your company lose. Consult a lawyer for actual advice and next steps.

Of course, it's also possible you signed a contract that basically says "we can just decide not to work and you can't do anything about it" in which case, sucks, and fire whoever negotiates your B2B contracts. But also, those clauses can be void if the violation is serious enough.