Not quite DIY but im sure you guys will be up on this matter.
I moved into my new house in September, and received the same direct debit billing amount from n power that was in place for my old address.
I rang n power to inform them that I was now at a different adddress and had informed them of my final meter reading at the old address. N power told me they would refund me for 3 months direct debit for that address.
N power had no record of a last meter reading for my new address
At my new address I switched to scottish power having been there for 3 months without a bill, scottish power have set me up on a direct debit based on a monthly usage reading i gave them. Where is the bill for the first three months?