@
suej
Phillips Cohen appear to be a firm specialising in winding up affairs of the deceased, from what I gather. Might just be worth writing to them, registered post, and explaining that you have already dealt with matters.
https://phillips-cohen.co.uk/
AS you say on their website they post (my emphasis added)
"Phillips & Cohen Associates (UK), Ltd. built its reputation in the credit industry by providing specialised compassionate engagement services to clients,
enabling them to realise additional recoveries and deliver tangible “Treating Customers Fairly” process enhancements. We are an award-winning industry leader providing expert niche services recognised for our unique and compassionate style of customer interaction. Phillips & Cohen Associates (UK), Ltd. currently works with over 70 of the UK’s largest creditors across a wide range of industry sectors, including banking, finance, home shopping, utility, telecom, debt purchase, local government & central government.
So the client (like E.On Next has an alleged debt on their books, but don't have the expertise to deal with it themselves, so they either engage a firm like Phillips-Cohen (or sell the debt to them) and then at least they'll make some recovery of the debt they think they've got, whereas if dealt with internally they'd have got nowt.
The trouble is that these firms can be very persistent and aggressive. There are only a couple of reviews on trustpilot - neither are good.
When there is a bereavement the account of the deceased is effectively frozen and any debit or credit dealt with by the executors/administratore. But supplies to the property live on and a new person, once again the executor/administrator, becomes liable for the charges, until either the property is vacated or sold. It's not clear to me what the solicitors are claiming and it will be different in each case.
But it gets complicated with another party becoming involved and in my view is a practice that shouldn't be followed.