I have been having issues with correct billing from about March. I pay the correct amount for what plan we are on, but the incorrect billing never gets addressed in spite of me sending in copies of the invoices and asking for them to be fixed.
With the switch to a new internet platform provider for AGL, we got another invoice, which had no carry over balance, the wrong charge for the plan we are on, and it had no indication as to what period the invoice covered. This to me would invalidate the invoice. I would be very concerned for those that have a direct debit in place.
I have sent emails, phoned (left on hold for 36 minutes then gave up) and am giving this a try.