Not giving offer promised during upgrade.

Had the pleasure of upgrading my phone, and they even offered me 12 months free Amazon Prime. Received the email to activate it, but the activation link did not work. Phoned the call center, the first time and they gave me an alternative method to activate the free Amazon Prime offer. Then the problems started...When you log in to receive the offer, it gives you a 3 month Apple music instead, no Amazon prime offer. Spent another 1 hour and 22 minutes explaining to the staff at the call center that the wrong offer is loaded. Simple, I received and email with the Amazon offer, but if you activate it is giving the wrong offer...

They first blame me that they can not help me because I am not giving them the "one time pin" that I received (which actually states that they will not ask me for the pin and I should not give it to anybody) And then, when the manager enters the call they change and then blame it on an existing subscription that is totally separate from Vodacom? I need to downgrade an existing Prime subscription I have, totally separate from Vodacom...an then the offer will appear? What is this, a carrot they hold up to get you to upgrade your phone and then not give it. This was by far, the most frustrating experience I have ever had with any call center never mind the false offer they gave me when I upgraded.