Thank you for your responses.
I have attempted to change my email address. My old email is no longer active. I registered for an online account some years ago with my old email address. We have received no bills, which have obviously been sent to my online account, which is inaccessible. It has only caused alarm this month because of the very large increase. My OH is prepared to wait to see what the direct debit amount is next month ?. I will try and speak to BG again tomorrow, as I need an explanation and now wish to revert to receiving bills by post. The problem is there are so many people in dire straits currently so it is nigh on impossible to get through.
Joanne123. Yes, I would be happy to discontinue direct debits after this experience, but OH is reluctant and he deals with our joint account online. However, I might insist if I am not happy with the outcome.