Not prepared to work with customers

I have had a Nedbank bond for 3 years and at the time accepted a higher than average interest rate due to it being a building loan. I contacted Nedbank's Home Loan division on Friday to see whether they could revisit the interest rate due to the amount owing now being in the region of 50% of the retail amount of the property, coupled with the fact that the interest rate is high in general, but they weren't even prepared to listen to the request. I am very surprised at this attitude from Nedbank as it shows that they are not prepared to work with their customers. With this type of attitude it makes me wonder whether I will do any type of further financing with Nedbank, let alone consider them to be my primary bank.