Ofgem Complaints
Operations Division
Ofgem
9 Millbank
London SW1P 3GE
Don't expect to get very far. Others have tried and found a Catch-22 where if you have already complained to OFGEM then the Energy Ombudsman will refuse to take up a case.
maybe there should be a regulator that companies could complain to about the administration of the various schemes rather than the regulator being tasked with both running the schemes and regulating them.
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