REALLY high first bill?!

So… I’m a new homeowner, and my first months electricity bill was £122? I live in a small 2 bedroom flat. I have two meters installed, but 3 meter readings (one is an economy7 and I don’t know what the other one is) can anyone help?

but 3 meter readings (one is an economy7 and I don’t know what the other one is)

A few questions:

Are you referring to the actual bill, as in the value on the PDF that is deducted from your Bulb account? Or are you talking about the payment you make by direct debit?

Did you submit your meter readings, and if so are both the opening and first month readings correctly showing on the PDF?

Have you attempted to find out what the third meter is? I certainly wouldn’t want to be paying for something where I had no clue what it was powering.