Irate customer - Worst customer service ever!

I upgraded my Cell C contract on December 2nd, and to this date I have not received my device. I've called Cell customer service and then get put through to the delivery department with no answer as to when I'll receive the device. After numerous calls to the courier - Courier It - fighting for answers as to what's going on, they sent out the wrong device. I then had to log a call for the courier to collect the device and after a week they picked it up. So back to Cell, with a couple of calls to find out when I'm actually going to receive the correct device, I get told that the returned device has to go back to the repair centre to ascertain whether everything is in order, baring in mind that the box is still sealed, and once their checks are done they will notify me. Once this notification is received, I have to call Cell to let them know that they can now start issuing a new device which will then take 3-7 business days to be delivered. It's been 20 days without a phone but they made sure to change my profile to the new contract which I cannot use. CellC and Courier It have given me the worst customer service I have ever experienced.