Vodacom upgrades inefficient

I contacted Vodacom to settle my handset in full as it was ****** in January. At the same time, I was advised I may upgrade my contract. I received options of packages and asked if I could think about it. On Friday last week once I had made a decision, the sales consultant told me that he would need to contact the warehouse to check which colours are in stock. By Tuesday, he still hadn't called back and I tried to contact him. I was told he was sent an email to phone me back. The following day, I still hadn't received a call and I phoned again, only for another sales consultant to place me on hold for 30 minutes. I have explained that this is an urgent upgrade as I use my phone for work. When I contacted the agent the first time, I even apologized for not being to make a decision immediately and for wasting his time. All along, I have been courteous and patient but I am very frustrated at the moment. Going in would be a huge inconvenience for me, not forgetting that I would have to pay the admin upgrade fee which I was trying to avoid in the first place.