Delayed and or non delivery srrvice

I hired a vehicle from Europcar in March. The vehicle was returned 15 days later. I paid a deposit of R2 500 in cash and got a receipt. I was told my deposit would be refunded to me 10 days later. We are now sitting in May and my deposit is yet to be refunded. I was mailed a refund notice but no money's paid as yet. The refund after taking into account filling of fuel, which I couldn't do, as I was in hospital, came to R2 074.00. This might seem like a low amount to Europe car but is a significant amount to me. Europcar, please refund my monies ASAP as it is rightfully mine.