What the Energy Ombudsman does
The Energy Ombudsman is an independent body that resolves disputes between domestic energy consumers and their gas and electricity suppliers. They are not part of Ofgem, not part of the energy company, and not a court. They investigate complaints impartially, looking at evidence from both sides, and make a decision. If you accept their decision, it is legally binding on the supplier. If you reject it, you can still take other action such as going to court.
Energy company supply licence conditions