I thought that, if you got to a certain level of credit, the power companies had to pay back your credit as a lump sum? I seem to remember a scandal of elderly people dying in poverty, yet they were massively in credit with their bills.
I ask as we found that we were over £500 in credit, yet all they’ve done is reduce our payments. DH won’t get in the phone and ask for it back, and the account is in his name.