So many lies of stock availability

I am totally disgusted with the service received from vodacom on the 3 October 2019 I got a call from vodacom to upgrade and I accepted the upgrade for a Huawei mate 20 pro twilight I even received a quote which I accepted, on the 4 October 2019 I had to call vodacom numerous time to find out what is happening with my upgrade only to be told that the quote was canceled as Vodacom does not have stock of this device. How on earth can a quote be sent for something that cannot be supp****? To make things worse for vodacom I called cellucity in Bedford who told me they can order me the Huawei mate 20 pro from vodacoms warehouse(but vodacom cannot supply me directly which I don't understand), then on top of that I called vodacom in Meyers day and guess what they have the device in stick which I have now taken. I was originally quoted for a contract of R499 a month for 24 months, now the contract I have is for R699 a month.

Why could vodacom not supply me with the correct device after I was quoted for it and accepted the quote for R499 a month please can someone help me understand? Is it because they wanted to force me to take a more expensive contract? I await a response for this pathetic service