Wrongfully debited

I made an arrangement on my accpint for end of February and made small payment end January. Guess what they made a wrong arrangment on my account and wrongfully deducted R500. Now i sit with the consequences because they cannot refund immediatly. I must suffer due to their fault that my money was taken onthe wrong date. I have started a new job so im not running away i want to pay. But now im sitting with no money in my account and tjey cant do an immediate reversal for me. Im truly disgusted.