Worst Online Service from Vodacom

I did an online order with Vodacom on the 15/02/2024 and when I spoke to the agent (Nicollete) I advised to please change my delivery address and she agreed. I have been now trying to cancel this order and they keep saying that they cannot cancel till they receive the device from the courier. You call Vodacom and no one can assist you, I was told by one agent that they are working from home and cannot assist. This has been the worst experience of customer service I have received from a service provider.