Hi there HardworkAusFam1,
Welcome to the AGL Community!
If you've overpaid your Bill Smoothing plan, then you are absolutely entitled to a refund should you elect to receive one. I'm sorry to hear that we've made this so difficult for you. I'll ask that you send me a quick private message by clicking on my handle (jaydeny) with your account number and address so that I can follow up on this.
Kind regards,
Jayden