Poor Customer Service

I upgraded my contract on the 27th April 2015, to the Samsung S6 at Vodacom Nicolway in Bryanston. On Thursday evening, 30th April - S6 stopped working. I took the phone back to Vodacom, Happy (store manager) explained it could be an out of box failure - Vodacare needed to confirm this before the store replaced the device-but this will only happen next week due to the public holiday. I agreed to take the phone through to Vodacare so that I could have the issue resolved the same day as I was made to believe should I opt this route I would have a device that afternoon. Vodacare confirmed the failure, I went back to the store &requested a new device- being well within my 7 days period I asked to please change the device to the Iphone instead. Now I was told this needed a reversal transaction for the S6 before the Iphone is added on but this needed to go to HO & this would take about 24 hours. When I followed up this morning, I was told that I need to wait-this will only happen next week, I'm not Vodacom's only customer. The store manager is exceptionally rude& unhelpful and I'm still without a device after being a loyal customer for about 6 years now. I'm looking to cancel my contract