The Banking Ombudsman says her office has received more complaints about mortgagee sales than ever before.
Ombudsman Deborah Battell told Nine to Noon that people are angry that their houses have been sold for less than they think they are worth, and some have taken their bank to court.
Ms Battell said her office has investigated 118 mortgage finance complaints, which includes mortgagee sales, in the last year, double that of 2007.
But in the cases she has seen, she said the bank has followed the mortgagee sale procedure, and has not rushed into a sale.
Ms Battell also people who are struggling with mortgage payments need to ask for help sooner, to avoid mortgagee sales.
realestate.co.nz chief executive Alistair Helm says the rise in complaints is likely due to the sheer number of mortgagee sales, which have tripled on his website since 2007.
Mr Helm says the number of mortgagee sales is now falling, as the economy recovers from the global crisis.
