I spoke to an adviser who said I can't cancel my Dad's contract without sending in 15 page POA. He didn't know about the gateway code system. Seems crazy and we just can't afford to keep paying it each month at an empty house.
Do you have a POA? Gateway systems appears a method of accessing government or HMRC data
Are you able to phone CS 03301234150 and get your father to confirm you can speak on his behalf ?