Disgusting service

I upgraded my tablet contract more than a week ago and was told id take delivery this past week. I have not recieved anything. Ive tried calling the call centre, they are useless cannot help so i went to telkom festival mall today to get told they cant help call the call centre. I would like to cancel the ugrade that was done and cancel the tablet contract that expires in december, i have had it with the lack of service from the start of both my contracts. I do NOT want to take delivery of the upgrade any longer so cancel that and my contract uon expiry date. I refuse to call your call centres again or go to any of your stores as NO ONE is willing to assist me!