bad customer service

I went into the MTN store to upgrade my contract. I asked the consultant Dominique about the IPhone 6S but apparently she had no knowledge of it. Only to find out that the IPhone 6S was released and in store the very next day after I upgraded. I then went to the V & A store where the consultant advised me that the upgrade could be reversed but that I needed to go to the Tygervalley store where I did the upgrade. I then went to the Tygervalley store 3 days after the upgrade was completed with the unused phone in box. The consultant called the manager who declined the request outright saying he called \someone"and this was not possible. I then gave the phone back"