I would give them a call tomorrow and see what has happened.

Do you have an old fridge or something that could have chewed through the power? I still don't think it should be that much though. We had a takeaway shop and each quarter for us was roughly $2500-$3000 and we had A LOT of stuff running all day, every day. I know prices have gone up but surely that is a mistake!

Hope you get it sorted.