They just cancelled the deal

Extremely unsatisfied and treated unfairly. Bought a car on auction on Sunday, paid the balance in full on Monday, took and Uber to WBC Johannesburg South to collect the vehicle, only to be told the deal was cancelled. Took an Uber back home (Uber costs are just my problem), and then requested my R23,000 to be refunded. It is already Thursday, and only after following up on my refund request, I only get asked now for my ID document and proof of bank account so that they can process the refund. Do not buy a car on auction over the internet, because when you go there there following day, the deal get cancelled and it is your problem how you get back home, and then you have to fight a week to get your money back. These people don't have customer service. They don't care if you don't follow up, nothing will happen! If you buy a car on auction, and don't honor it, you will lose your deposit, but they can just cancel it on their side. How is this fair?