Appalling Customer Care

I bought a baby car seat online, on an online exclusive special, paid for the product and delivery fee on 20 May 2021. I called Makro following up on the delivery and I was told in 5-7 working days I will have the product. Makro called me offering a R300 voucher instead of the car seat claiming a system error and I declined as I am expecting and need a car seat. Today on 28 May 2021, I received a call from Makro, I could not speak and asked to be called after an hour, the person who called, Wandile, said she will send an e-mail confirming that I asked for a call back after an hour, I agreed. I have now received an e-mail from Makro advising "as per the telephonic conversation" I have agreed that my order is canceled due to a pricing error and the voucher still stands if I want it and I can follow up with the Ombudsman and will be receiving a refund. What an appalling way to deal with whatever is happening on Makro's side. I ordered a car seat and I want a car seat, not a cancellation, not a refund, and certainly not a R300 voucher. The error is not on my side as a customer and I do not see why I should be suffering for it. I want my car seat which has been paid for. I am sitting not understanding what they even mean by their pricing error or their system error or whatever the excuse is.