Nedbank is a ****!!

I sent someone a careless transaction of R750 this morning and when he went to withdraw he couldn't as it says the voucher has been used, he also found other people with same problem there, when I called Nedbank they say will have to wait until next week Thursday to be refunded! So they will be holding my money for all this time and make interest out of it while the person I sent to cannot pay for his rent bcos of their fault! This is a **** by Nedbank! Why not issue out a new voucher number same time? Why? Do banks have a conscience, so tNedbank doesn't care at all about people! Where am I suppose to get another money now since they holding I stress because of this I will lodge this with the ombudsman! Surely somethings gotta give, banks cant keep exploiting us like this!!