Billing you for their mistakes on the contract add on's - Pathetic Service

Upon my previous Hello Peter Complaint - Vodacom cancels the new contract and says they reversed my package - Pervious invoices was R1,374.03 - Happy to pay this amount as this is what i was paying over the past year. This month invoice is R2071.50 - All the extras that was added - Vodacom says i am responsible for the amount - How do you reverse the contract but i must still pay for the mess up that Vodacom initially caused - which is really unfair to me on both my numbers that was upgraded and then reversed because Vodacom didn't uphold what they sold you to what you received - Highly irritated as i mentioned in my previous post - Been a customer for the past 20 years and had never missed a payment with Vodacom.