Vodacom extended my contract without my consent.

On the 30th of October 2017, I upgraded my Vodacom cell phone contract at Savannah Mall, In Polokwane. I was assisted by Ralton vodashop agent at Savannah Mall. Ralton upgraded my other number by error. Nevertheless the following day, that is the 1st of November 2017 I returned to the shop. Ralton assisted me to cancel the wrong upgrade. However at the end of November I realized Ralton has upgraded both my numbers. i complained the whole of November 2017, Ralton kept on promising that he will fix the problem. The problem was finally resolved by Vodacom in March 2018 after I have reported the matter to the Consumer Commission. The other contract was reversed and migration fee was set aside. Now the problem is my contract end date was December 2017 and due to Ralton negligence the contract end date has been moved to December 2019. I contacted Vodacom Customer care on the 16th of April 2018 spoke to Zethu, who indicated that it is only Vodashop that did the Upgrade can correct the error. Went back Savannah Mall Vodashop, Ralton could not assist. Therefore Vodacom is benefiting from the negligence of its agents and/or employees. Vodacom has extended my contract without my consent.