Hi Melanielacey,
Good question!
Keeping in mind that thousands of people move properties every week across the country, energy retailers (not just AGL) subsequently receive thousands of requests to set up new accounts each week. Unfortunately it's simply not possible to double check each of these connections to ensure the correct address and metering information has been provided. We do rely heavily on our customers providing us the correct information to ensure that this is a seamless process and take this on its merits.
I'm sorry to hear that this mistake has had such a negative impact on you and I invite you to get in touch with me via private message if there is anything that you currently need a hand with.
Kind regards,
Jayden