Can’t log in, being billed, support sent me here

I am having a similar issue. I am being billed monthly for a B2B Essentials account, however when I logged in today, one of our tenants has disappeared and the account says it is on the Free plan. I have been unable to get any response from support - I reached out to Sales and Engineering. I was billed twice in April, and I need to resolve this ASAP. Can someone please assist? Thanks.