Accounts - Inaccurate information during upgrade

<p>I recently upgraded my contract, March 2017, the agent I spoke to during my upgrade assured me that I had one month left to pay on my old device. The following month, April 2017, I paid for the last month of the upgrade. Now, May 2017, the same high amount was taken off my account. On contacting customer service, I was refered to the upgrade department who then told me that April 2017 was my last month so the final high installment was paid on May 2017. I am very unhappy with this as I specifically asked the agent that I spoke to during the upgrade which month would be the last. Vodacom are being rather unfair in their provision of information.</p>