I'm getting a bit pissed off with Octopus Energy...
Them: "We made a billing error and that's why you couldn't get a refund of excess credit"
I asked what the error was, what the affected amount was, and which bill it applied to...
"We made a correction to your bills this is fixed now."
Strewth.
@philpem I have been underwhelmed with their support recently too, fwiw.