Welcome to the Community!
Your account balance only updates online every 2-3 days, so if you've very recently been issued a bill, there is a chance that your account balance may not yet have updated online to reflect this. We'll ask that you allow for a few more days for this to update. If it doesn't, you're welcome to get in touch with our web chat team (aglener.gy/ChatCom) who'll be happy to jump into your account and look into things further!
Thanks for getting back to me, Me3!
Based on the delays you're experiencing, this is definitely something that is worth looking into further. So that we can do this, I'll ask that you send me a private message including your AGL account details as well as any relevant screenshots through to and we'll be happy to help further!