I am totally disappointed at the services I received from Npower.
Disorganised billing and charges. Deduct any amount they like from your account once they have your details.
I pay as much as £215 a month yet I receive letter asking saying I owe in a house I live alone.
Terrible and disgusting.
I switched from Npower in January and have been paying between £65 and £75 actual reading.
I do NOT recommend Npower sorry!!