Energy Ombudsman
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They will fight your battle, and take away your stress.
I battled with British Gas for seven months to get several problems sorted. I phoned them every week. I only found out later all my complaints were being rejected and no one told me, then just went in the bin. Without the assistance of the energy ombudsman, I would still be in this revolving door of pain now. They took my case on and got all my issues resolved in 2 months.