Double charged for cellphone after upgrade

<p>In my past experiences, I only paid for the new device after an upgrade. However, this time around I have been made to pay for two devices.</p> <p> </p> <p>I upgraded in February & was expecting the new rate to be made effective March, as discussed with the Sales person. However, looking at my invoice/bill, it reflects I've been made to pay for two devices. </p> <p> </p> <p>This is souring a very positive relationship I've been having with Vodacom over the last 2+ years.</p>