Yes, I understand that. I was asking if it was doing the same thing whilst connected, but with the ECV off?
You said you had problems getting BG out to exchange it. If it was counting whilst connected, but with the ECV off, then I can't understand why you had issues getting them to swap it:
'Hello, BG? Yes. My gas meter's display is counting up despite the gas being turned off.'
'OK. We'll be out straight away to exchange it'.
Or, had you not tried that and it only came to light once it was removed?