Non stop debit orders

I have a personal loan with nedbank. My debit order day was due on the 01st of December but didn't have sufficient funds in my account. On the 08th of December a consultant called n we made an arrangement for the 23rd for Nov n December instalment.on the 09 1 instalment went of n on 11th the debited 2 instalment ,again on the 24 ,1 instalment from the 2 instalment was refunded but they went back again today to debit my account. N on the 23rd it looks like they deposited the instalment amount n re-debited it again. I want nedbank to refund me today coz when I call their call centre they telling me call back on Monday n I wasted my airtime for nothing. I want my money back.<br> Pls help hello peter .<br> <br> Thanks<br> Mary <br>