Around two-thirds of complaints made about financial service providers were related to current bank accounts, new figures have shown.
The data was released by the Channel Islands Financial Ombudsman, an independent body which resolves complaints with financial service providers.
The data which covers July to September this year show fraud remained the top complaint in the islands.
115 cases were opened in that period, with two-thirds relating to current accounts, with the remainder being health insurance and home emergency insurance.
Around a quarter related to fraud, with suspension of service and poor administration also top issues reported by consumers.
Most of the complaints in Guernsey related to the insurance sector, while most in Jersey were linked to banking.
More than two-thirds of complaints were based in the UK or the rest of the world, with 26% coming from the islands.
214 complaints were closed in the third quarter of the year, with 61 successfully mediated and 49 of these determined by the CIFO – the majority of which were in favour of the complainant.
77 complaints were dismissed as they were either submitted too early or too late, or related to an exempt financial service.