Debited twice

I am currently paying R600 on my loan with Nedbank. On the 29 07 2015 R600 was debited successfully from my account. Yesterday another R600 was debited from my account by nedbank. When I went inside the branch I was linked with the people in question and they admitted of the error but they said I have to wait for 7 days for them to refund me. I need to be in free state on Thursday to attend my sisters funeral and I want my money asap. This is 1 of the reasons s why I left nedbank. **** treatment that customers pay for. I find it very stupid and inconveniencing because now I am stuck because a stupid bank debited me twice. I need this money asap just for peace and let me go and bury my sister with dignity not with my hands between my legs.