Appalling service by Vodavom online

I was phoned by Vodacom online in December 2017 to advise me that I am due for an upgrade, then on the 13th December 2017 I ordered an iPhone 8 and the order was confirmed on the 14th December 2017. The cellphone was delivered and I did not like the color therefore I notified them and arranged that they fetch it so I change it for the color I prefer. After numerous calls to their office they eventually sent a courier to fetch it. I then contacted them with a hope of giving them my preferred color for them to effect an exchange on their part. It was explained to me that the order have to be cancelled in the system first then I should start the process from scratch to order my preferred color of an iPhone 8. From January 2018 to date, I have been calling Vodacom and I was given the same feedback to say the order is not cancelled in the system and it is escalated. I spoke to Ms Joyce, Ashley, Melissa, Leandra, Jinel and others, all of them did not go out of their way to resolve my problem. They kept on saying we will call you back and they never did. I even advised them that I intend exposing their incompetence by sending my experience to hellopeter it didn't bother them at all. How possible is it that it takes Vodacom six months to cancel an order in their system for them to give me what I want? Do they really care about customer service? Are they frustrating me deliberately because I returned a phone they delivered to me?? The sad part about this matter is that I have been paying for this phone for over six months, I am paying for a device that is not in my possession, I did bring this to their attention hoping it will be reason enough to treat my matter as urgent clearly to them it is business as usual. We still have a long way to go as a country if we still have such appalling service in companies in our country. I went to Vodacom Eastgate and Centurion hoping they may assist I was told its beyond their control as Vodacom online is a different business from theirs. Paul