I get duplicates too, not just about my bill. Could you share here whatever advice you're giving via private emails please.
Hi @terrypin and thanks for your post.
Sorry you're also receiving duplicate bills. This is an account based problem so we'll need to take a closer look for you. I've dropped you a private message so please send over the details. Just a heads up, we're very busy at present so it's taking longer than usual to reply but once you send on the details we'll get to you in turn.
Cheers
David