Cancelation issue

I made an upgrade on one of my cellphone numbers on 23 august and requested to cancel the upgrade on the 28th, i have called 3 times since the 28th for them to cancel it, and request a courier to collect the device, when i phoned today the collection was still not logged. I am tired of phoning vodacom everyday, having to explain the story over and over. I have 6 contracts with vodacom, why is no one doing there job.