Worst Service

I upgraded my contract online on the 29/10/2019, while doing it, I asked the agent when will I get the parcel they said with 3-5 business days. I told her that there's a possibility that I might move before I get the delivery, so if that happens what should I do. I was told i can call the same number to change the address, I did that on the 5th of November. Friday I called to confirm if indeed my address was changed, but to my surprise it was not changed. I asked the other agent to change it. Today on Monday when I'm supposed to get my parcel I'm being told that they still have my old address on their system. When I call vodacom I'm being told I should wait another 24hrs to change the address again. This is not acceptable after calling so many times for same thing and I'm still not getting the help I need. I mean how hard is it for one to change address. It's been over 10 days since I placed the order and even now still haven't received it.