Some two years ago cooperative energy received a request to switch us to a single tariff not a day and a night tariff. Over two years they have failed to carry it out despite numerous phone calls and letters. Not only that their staff seem to think that their responsibilities cease when they pass on the matter to somebody else. I have a computer printer out probably three ft long concerning the written requests and responses and I never get anywhere or find anybody to act responsibly over the issue. Letters to the managing director have gone unanswered and each member of staff thinks the issue is closed when they pass it on to somebody else. Naturally we have changed our energy supplier. it's an appalling situation and they seem to treat their customers with total contempt and indeed some of their staff appear to radiate complete indifference when you speak to them.