Frustrated, Disappointing , branch manager playing ignorance

I did traded in my car renault sandero on the last week of December 2018 and collect the other car renault captur that I signed the agreement for, The sales person said he will email me the agreement but never did. The second week I was suppose to send the car back to be fitted with new tyres as agreed when I collected the car but I received a call from the sales person telling me that they made a mistake they gave me the wrong car model and I need to return the car. I actually didn't think the worst of the situation as they said the car I was suppose to get is available. I had a meeting with the Manager Bruce Goosen and the sales person was also present and he promised the car will be available by the 12th of February 2019 and would refund the January car installment. The 12th February came there was no car and they don't know how when the car will be available. I send them an email asking them to tell me the real story as I lost faith that the car is available and the refund they promised has not been paid also and there is no feedback.

In all the email chain the manager Bruce, sales person Percy and the regional manger Nash where included. I also complaint that about lack of communication where I always have to be the one following up. I also made them aware that is coming near the 2nd month and they will have to refund the car installed again and they never rep**** to the email, after the installment was deducted I send them proof and still no response from all parties. I called the branch spoke to the sales person said he think the car will be back from repairs on the 6th March and i asked again for them to give me feedback but no one has called me. So I make car payments for the car are don't have, I struggle to get the installment refunds as promised, there is no communication what so ever not sure if this will ever be resolved.

I'm now scared what condition the car really is when it takes this long.

I also want to know if what they do is even legal.