Upgrade contract pricing for Z5

On the 7th November I went into the Vodacom shop at Menlyn and upgraded to the Z5. I got signed onto a uChoose Flexi 200 plan which will activate 30/11/2015. My contract cost stipulates R350 for device and R199 for the subscription.<br> <br> Today I checked the cost of the contract on Vodacom's site. The price has gone down to R301 for the device and R199 for the subscription, and on top of that you get an option of for example a Skull Candy headset with the device.<br> <br> As my new plan will only activate 30/11/2015 I want to have the price adjusted as it is currently advertised, and want to receive the free headset. It has not even been two weeks since receiving the device. I've called the upgrade number (***) and they refer me to the store, but when I try to call the store I get no answer (seems the number isn't working, maybe due to the renovations).<br> <br> Please assist me to fix this issue. I do not need to swop the device, just want the contract to be adjusted and receive the free headset.