Upgrade nightmare

Did an online upgrade first week of Dec 2017 which for some reason did not reflect on Vodacom's system , 2nd attempt completed via the call centre and was assured by the agent the iphone 6s plus was in stock and will be delivered to me in 4-5 working days. Get a call 2 days later to confirm delivery address and if I will be available to receive phone the next day . Whole day goes past with no delivery , after holding 20 mins for the upgrade dept Im told the phone is currently on back order after two other agents told me there is stock available? Ask to speak to a supervisor , was told someone would call me back - still waiting for the call or any feedback from Vodacom. Called the upgrades dept again on the 3 Jan 2018 after no response from Vodacom and holding on for 15 mins only to be told by the agent that Vodacom will no longer be receiving stock of the iphone 6 Plus and my upgrade has been cancelled !!!!!!! After all the calls that I made and told numerous times they were getting stock and no feedback whatsoever and my upgrade is cancelled without even contacting me.

Yet the iphone6 plus is still advertised on your website???

DISGUSTING SERVICE!!!!!!