You should escalate this as a billing dispute rather than continuing with multiple emails. Send a single consolidated message to billing@zoom.us and ar@zoom.us with your account closure confirmation, invoice numbers, and proof from Renewals that the account was set to end in April. Also try contacting your Zoom account executive or sales rep to open an internal billing escalation, since support tickets are blocked on your side. If there’s still no response, request formal escalation to Zoom billing operations/collections.