An autistic man in Edinburgh spent years receiving threatening letters from OVO Energy addressed to "The Occupier," demanding payment for an account that was never his. He is supplied by Scottish Gas. OVO's demands escalated to threats of debt collectors and a requirement that he admit an OVO agent into his flat to "prove" he didn't have an OVO meter. Neither the home visit nor countless phone calls resolved the problem. The root cause was banal and structural: the national meter database — the central registry that maps physical meters to addresses and suppliers — had registered gas and electricity meters from a neighbouring property to this man's address. OVO corrected the gas meter registration but says another supplier "rejected multiple requests" to update the electricity meter record. The billing system kept generating demands against an address that owed nothing. Call centre agents confirmed repeatedly that the man had no OVO account. They were powerless to stop the system. This is the critical failure: a billing platform that overrides its own operators. Human confirmation that no debt existed could not halt automated collection threats. The system's default was to pursue, not to pause. Only after the Guardian's Consumer Champions intervened did OVO agree to suspend demands and issue a letter of deadlock — the formal mechanism enabling a complaint to the Energy Ombudsman. The Ombudsman's investigation, which granted access to the underlying database, confirmed the electricity meter was correctly registered to a neighbouring address and supplied by OVO. The error was internal to OVO's own billing system all along. OVO was ordered to pay £150 compensation. The bills have ceased. The compensation is derisory relative to years of psychological harm inflicted on a vulnerable person. The case exposes a governance vacuum: no single entity — not OVO, not the database operator, not the regulator — had both the authority and the will to stop automated harassment of a person who owed nothing. The deeper pattern is familiar across UK utilities. National databases are authoritative but error-prone. Correction mechanisms are slow, multi-party, and require the victim to prove a negative. Automated billing systems lack circuit breakers for disputed accounts. Vulnerable consumers — particularly those with disabilities that make confrontation and bureaucratic persistence difficult — bear the full weight of institutional failure. The £150 remedy signals that the cost of terrorising a vulnerable consumer for years is approximately the price of a modest restaurant meal for two. Until penalties scale with harm rather than administrative convenience, the incentive structure rewards system inertia over system correction.