Vox Telecom, useless billing department!

I recently upgraded my line through Vox and the latest invoice that I received from them now has a bill on it for 2 fiber lines and I only have one fiber line! I then called accounts as per the instruction on the invoice to notify them of this before the debit order went through and I was abruptly told to email them so they can rectify this. I immediately sent *** an email to let them know and nobody bothered to respond to me! Vox has now debited my account for 2 fiber lines in error! I need someone to fix this ASAP and return the money to my account!