I’d certainly look at getting a new phone, even a very cheap temporary replacement. I can’t imagine how difficult it must be without one, nevermind for your banking.
If you still have access to your email you can then get back into the Monzo app, manage all of your finances and utilise the chat feature within. This is by far the quickest and best way of communicating with Monzo.
Their primary method of support is via chat in app and this is where they direct you for all customer enquiries. Through the app they can see a lot of detail without needing to ask and can verify you’re the account owner to name a few - thus resulting in quicker responses and resolutions (in most situations).
While frustrating, all you can do is wait unfortunately. I imagine the only reply you’ll get is that they’re still investigating and can’t share any further detail, so it’s unlikely you’re missing out on anything. As others pointed out in the discussion earlier, it takes some time for these reports to be fully investigated by all parties involved, so you’ll only hear back when they’ve concluded or need more information.
Great news about getting a replacement phone so quick though. Sunday isn’t far away so you’ll be back up and running in no time