Pathetic Service after upgrading contract

On 1st September I upgraded my contract via the corporate desk on ********** 325. Delivery of the device was promised in 5 to 7 days. after the 7th day I followed up to find out on the progress as I had not heard anything. I was then given the courier number. The courier company DSV advised there was a problem with MTN providing them with an incorrect ID number. For the next 10 days I have been calling the corporate desk to get this corrected and each time I am told the matter has been escalated. I requested for the upgrade to be cancelled so I could walk into a store an get the device immediately but then I am told it takes 3 weeks for the cancellation. it is now 20 days since the upgrade, I have not once received a call from either the courier or MTN to let me know what is going on. I am going to be billed for the upgrade yet I don't have the device!! Shocking service and you would think the corporate desk would provide a decent level of service?