Frustrated Client

Hi I recently cancelled myself and my wife's contract through vodacom. I was advised by the cancellations team that telephonically there would be no further debit order. I then went into the store in phoenix and spoke to a consultant who also confirmed no further debit orders as I paid over 5k to cancel a 370 +- contract. Paid and settled received the slip and invoice. And so I thought all was well and resolved only to be debited over 900 3 months after cancelling. I'm now left with a dropped credit score. Unpaid fees. Missed debit order fees and my account is in a negative. Mind you there was no communication about the 900+ . The last I spoke to a lady she advised T"s and C"s I am liable for any unpaid invoices. Then what did I call you guys for? What did I ask the cancellation agent about last debit for? If you were still gonna charge me and inconvienance me? The account balance shows 0.00 on the invoice yet u say unpaid? I spent over an hour on the phone with a call that kept dropping. I even went back to the store only for the same consultant to be extremely arrogant ND say theres nothing I can do. You have to sort it out? What ****! Call me sort this mess out investigate ! Do something because right now all I see are excuses.