Hi mishymoo
A number of things come to mind. Firstly, as Jalexa says, actual meter readings are vital.
Was the account opened to an actual meter reading and is the latest bill also based on actual readings? If they are, it does sound like a catch up bill as my colleague advised. Previous bills would have been under estimated and now we have the correct figures an accurate bill has been issued.
If this is the case, give us another call and ask for a payment arrangement. We will be happy to spread the debt over a similar period to that where we were sending estimated bills.
Do you have any meter readings at all? If you do, let us know what they are and ask for your bill to be re-calculated using these. In this way you will pay for energy at the prices applicable when it was used.
Also, check your tariff is best suited to your needs. For instance, are you on a two rate Economy 7 tariff but not using much at night so are not benefiting?
Did you inform us when you moved into the property? Did you give us meter readings at the time? Was your account started from this date and readings?
If this is the case any outstanding bills from before this time are not your responsibility. They are the responsibility of the previous tenant and should not have been mentioned to you. If this is not the case, you need to contact us to make sure your account is set up correctly.
Look at your usage in terms of kWh rather than money spent. This will give a better indication of how much electricity is being used. If you do have any actual readings during your time in the property it may be possible to compare different periods to see if there have been any major changes.
We have an Energy Efficiency team who specialise in helping customers reduce the amount of kWh used. Give them a call with details of your property and appliances to see if they can help. You may also find the interactive house on our website helpful for tips on how to save energy.
Hope this helps.
Malc