Audi Braamfontein playing games

Found a second hand car I liked from Audi Braamfontein. I proceeded with the application and recieved 2 approvals from banks. I was in the process in finalizing when another sales person invoiced the car out to someone else as the deal was in middle of being finalised due to 2 sales persons trying to race to the final line. How can this happen when I was told when I'm busing with the finance unless it's declined I had first choice