Vodacom Upgrade

I accepted an upgrade agreement for a 2 year contract with Vodacom on 01/10/2021. This was for an iPhone 11 - price suited etc. Today I phone and query and get told by the lovely lady that the phone is not available - must take a more expensive package now. What about my agreement? Surely this works both ways? She said she would come back 14h30 - I call in to find out and get told by a gentleman that no I need to take a more expensive package. Or take the XR (pre iPhone11 so like duh) or pay more or pay nearly the same over 36 months!! ************s of note. ****** actually as now it will cost me more and we had an agreement in place??? Like how does that work Vodacom? The inconvenience and lest we not forget this was for my daughters birthday - thanks Vodacom