Worst experience at Hyundai Umhlanga

My dad recently purchased a Tuscon N series for me, at Hyundai Umhlanga, the deal was signed and a R300 000 deposit was paid to Hyundai, the salesperson was content and said that the vehicle was ordered and we should receive it by the 20th of December. A week later he calls to say that he can only get the vehicle in 2018 and it will cost more so he wants to deposit the R300 000 back into my dads account. What kind of joke is this? I chose Hyundai thinking that it was a reputable brand however this is not acceptable. Today (15/12/17) I decided to speak to the dealer principal Anthea, hoping we could resolve this in an appropriate manner. Spoke to the Dp (Anthea) & she was really rude, pointing fingers & raising her voice to us so we walked out of the office and she followed us out repeatedly saying "if you think you going to get a vehicle out of me... " . Im still shocked at her behaviour as we are paying for this vehicle and she is not giving it to us for free. I feel humiliated after the manner in which I was treated, I mean Hyundai is not doing me a favour and I thought customer is king so how does a worker at Hyundai threaten me by saying il get no vehicle eventhough my deposit of 300k is in their account. I hope that camera footage in there will expose the dealer principal and the manner in which she treats customers. Highly disappointed in the service and attitude at Hyundai Umhlanga.