[ivanchaz]

That's unfortunate situation. It happened to me once before (though, we was using AWS that time. And, I believe the cost was smaller than the one you have right now).

What we did to recover the cost was to contact the account manager for our region at the time. So, maybe you could have better luck trying to find the particular person in linkedin. Or, have you tried opened a ticket from Azure console?

Nonetheless, I hope after everything has been settled down, you won't fire anyone (and treat it as learning opportunity)