A lass I worked with had the same thing, put her meter readings in online etc and her bills were far too low. Kept calling them and they insisted she was fine.
After a few months went by she got hit with nearly a grand, she rang up and complained. Fair enough she has to pay for what she's used but as they fucked up they agreed to half it.
Go the ought their complaints procedure and if you get no joy it goes to an ombudsman which I think is ofgem.
May go in the favour of British gas but if you don't try you don't get.
Remember to use the words inconvenience, stress, worry and panic. They are the key things which push a complaint forward.
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