Badvservice at Nedbank Brooklyn

I app**** for futhern loan with Nedbank Brooklyn and explained that i need XX amount to buy another house, but they advised that I can also get an advanced R79000 without changing my repayments. they approved a lesser amount on my initial application which i rejected and then advised them to process only the advanced amount but they preceded to process the wrong amount. It has been 2 weeks now going up and down at the bank, whereas they promised me to resolve this within 48 hours. I have been banking with bank for more than 16years now I don't expect this shabby services