If you open an energy account in your name, you will be responsible for all future bills on that account. Even if the account is in more than one name, each person can be individually held responsible for the debt. If you move premises, remember to cancel/transfer your account or you will be charged for any future energy usage on that account. Usually, you need to give your energy supplier at least three days notice.
It is also a good idea to read your meter when moving into new premises so you can check this reading against your first bill to make sure you don't pay for the last customer's usage.
Under the Privacy Act 1998 (Commonwealth), we are only allowed to assist the actual energy account holder with a complaint, unless permission, either written or verbal, has been given to act on someone else's behalf. If you will be sharing an account with someone else (ie. a partner or flatmate) you might want to open an account in both names so either of you can make an enquiry or complaint about your energy account.