Upgrade without authorisation

I called Vodacom in July 2017 to cancel my contract with them. They notified me that i can't do so because my contract only lapses in November 2017, therefore i will need to wait and call them in October. However i could not wait until the end of the year so i called them in September to find out what penalties i will face if i closed the contract now. They notified me that my contract has been upgraded. they would not give me the telephone recordings as proof of this matter to show that i have authorized an upgrade.