Transfer between departments

I have signed up for a contract starting June and added 500min at 50% discount. The contract started on 01 June 2024 and the 500min was never added. I had to call Vodacom to understand why the 500min agreed to was not added and they added in June. Now in July it changed to 45% discount (which is not what I've agreed to). I called Vodacom again and the lady I spoke to (after a 20min conversation explaining what happened and she checking) dropped the phone and I was put through to another department. As I am writing this review (while I am on hold) i am still on the phone and is currently told again that I will be transferred to another department. This is unacceptable that Vodacom just add/change what was agreed in initial contract I took out in June 2024. And then to be transferred to so many departments without Vodacom to actually assist.