daylight roberry

I have a contract with vodacom that was taken in April 2013, i started paying for the phone in May2013, To my understanding the agreement was that i pay for the phone for 24months (i have a copy of the agreement), i phoned the call center on Friday to find out the last payment for my phone and the lady i spoke to by the name of Andy told me that the last payment is in July, meaning that the payment has been extended to 26months. I refuse to pay for 26months as this WAS NEVER AGREED UPON and quiet frankly i cannot wait for this contract to end. I will not have any deal with Vodacom in the near future because of this mirepresentation to this contract. I have been a oyal customer for 5 years and this is the thanks i get.