Complaints about cheques have risen in the last year despite their use more than halving since 2010.
Banking Ombudsman Nicola Sladden said it had 56 cases relating to cheques from July last year to April 30 compared to 37 cases the same prior period.
That's despite cheque usage falling from an average of 18 per person per year in 2010 to just eight per person last year.
"New Zealanders' use of cheques has more than halved in the past five years as electronic payments gain popularity, but complaints to us have risen in the past 12 months."
Sladden said the main cause of complaints were delays in processing cheques and failure of bank staff to act as instructed or promised.