Refund for overpayment of overdraft facility

Good Day I Would like to register a complaint against Standard Bank and their collection agencies. I made a arrangement with another agency. I paid the amount in full. Last month i received a call from BD Attorneys for the same account. Not thinking it was my overdraft facility. I paid the amount. When i realised my error. I contacted BD and sent the necessary paper work.it is nearly 2 weeks later and they have referred me to Standard Bank.when i transferred the money into thier account. I demand my money to be refunded in the next 24 hours.