Personal Loan

I am a Nedbank Client, I bank with them and have a Personal Loan with them. My Loan is paid every month on the 24th always up to date. Today that Loan went off twice apparently they cant help me today and cant trace anything while bank statement indicates that Loan went off double and I should phone tomorrow I don't have time for tomorrow this is not right how they are treating me as a long-term client of theirs. I have rent and other daily things to pay and I don't have the time to wait for tomorrow or 4 days for them to correct the mistake that was made by Nedbank themselves!!!!