Voda-come to the party!!!

I upgraded my contract in July, when I received the handset I booked it for return. It was collected, and received back at Vodacom warehouse. After approximately 20 calls, my contact STILL has not been changed even though I have asked to amend the contract repeatedly- get told it’s being done. Get promised that all will be sorted and every week that goes by nothing has been done. My last call to a Jeanette ended with her promising me to come back to me in 24 hours and guarantees she would sort it out and call me back... that was 3 days ago... still no resolve.