Vodacom id greedy

July 2017 I took a 24 month Upgrade with vodacom for an IPhone. This was July 17.2019. I still had a Samsung Tablet which was due to end on October 2017. From month end July 2017 I received two invoices from Vodacom. These invoices where for the both devises. (IPhone and Tablet) So End of July 2017 Vodacom debited my bank account with total payment for both devices. End of October 2017 it was the last payment for the Tablet and I continued to pay for the Iphone as to date. So today I called vodacom to cancel the Iphone contract,I was shocked to learn I have to pay the Iphone till End of October, Because when you take an upgrade, the contract only kicks in when the initial ( first contract ends). That to me makes sense. However now I am asking why then was I billed from July for the Iphone? Now if i add up the payments month this will be over 24months that I have paid for this phone. This is now from July 2017 till October 2019. This is now 27 months contract. In this 24 months the contract price have double from the initial agreement. That I have let go. But now for vodacom to still be even greedy and 3 more months is unreasonable. I have called vodacom 100 times. Been put through all department. Cancellation, Upgrade, Billing , sale , You name it.I want someone to contact me and tell me where the 3 months payment is going. Please vodacom cancel my contract. I have been loyal from 2013. Is funny how from May 2019 you have been saying I am due for an upgrade because contract is about to end, But now that I took no upgrade, contract is only ending in 3 months time.