Putrid service yet again....

I have been battling for a month now to get my upgrade from the store which includes a VR headset. I have been to the store on four occasions now to follow up on the progress of the upgrade, each time I am told that they do not have stock and will let me know....

Now seriously how long can it take for Vodacom, probably THE biggest provider in SA to order ONE VR headset?? The manager of the Vodacom Store in Greenstone Mall is a ***ard who will not come and deal with an unhappy customer, said manager hides in a back office and tells the consultant that I have to travel over 20km to another store on the off chance that they may have the item in stock that I am looking for!!

Where do I sign to cancel my contracts with Vodacom because this is not the first time I have been treated this poorly... If there were an option for no stars, I'd most certainly have chosen that.