No Delivery- BAD service

Good day Vodacom. I am disappointed, disgusted in your service towards existing clients. Since my phone is due for an upgrade I had numerous calls from agents requesting me to upgrade my contract. Some days I even had three different agents phoning me. Last week Monday 30-04-2018, I agreed to an upgrade and was told that I will receive my new phone by Thursday 03-05-2018. I phoned Friday 04-05-2018 to follow-up on the device. Only to hear that Vodacom still need to confirm that I agreed to an upgrade. Some one was supposed to phone me to confirm the necessary. The consultant advises that some one from the relevant department will still phone me the same day (04-05-218) to confirm the datils. Nothing happened. Saturday 05-05-2018, the same story. Guess what? Monday 07-05-2018 still the same story. “Mr client we can see that there was an upgrade requested but still need to be confirmed by one of the agents in that relevant department”. There is no phone number, no one that you can contact because that department only work and respond via email. This is now more than a week later. It is for an upgrade; I am an existing client. If this is the way to treat your clients, it might be time for me to approach another service provider?? Kindly advise the way forward!