"They also said that they would not swap it out for a supported one."
From your comment I'm assuming you want one of these devices. Personally I wouldn't tolerate being dicked about by a commodity supplier like that. Formally complain to them, and if they don't fix it to your satisfaction within the eight week deadline, escalate to the Energy Ombudsman. That costs energy companies about £400 for each complaint that the Ombudsman service takes on, and the energy company have to comply with the outcome.
There's a better way, and that's to change supplier. And if your current mob try and enforce an exit penalty eg on a fixed term contract, then that's something else to take up with the Energy Ombudsman.
I've actually worked for E.ON, and whilst I'd still consider their energy offers if they were really cheap, I wouldn't touch any E.ON branded hardware offer under any circumstances. Far too much history of rubbish hardware support, running away from difficult markets or where they weren't making enough money.
Biting the hand that feeds IT
