Outstanding refund

I was sent to collect my brothers car on Monday (26/01/2015). My brother paid the car service via EFT and sent GM Centurion proof of payment. By the time I got there, the amount had not yet reflected on the dealers bank statement. I waited for 2 hours and the amount was still not reflecting. <br> <br> Since I was in a hurry and pressed for time, I suggested paying with my card and them refunding me within 48 hours. They agreed and assured me that they will refund no later than 48 hours. I waited for that period and nothing happened. I went to the dealership on Wednesday (28/01/2015) and found out that nothing had been done, I requested that they do a card reversal of which they did, but still, I still don't have my money. I'm very angry because it's quite a large amount. <br> <br> They don't release cars if they don't see payment reflecting on their bank statement, I'm going there today and I'm gonna stay there until the money reflect in my bank account.