I don’t suppose you were able to get a photograph of the meter before you left? I’m guessing when you quiered the meter it was by phone? They record their conversations so should have it on record.
I can’t stand British Gas and ended up going to the ombudsman about them. It was frustrating, but in the end they sided with me.
I’d suggest contacting them and if you have to citizens advice too. Good luck with it all
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