Lloyds, the part-nationalised bank, received nearly 2,000 complaints a day during the first half of this year.
The group said it received 288,717 complaints in the six months to June, the equivalent of 1850 each working day. However, just one in ten of the complaints resulted in apology or compensation for consumers.
Lloyds TSB received the highest number of complaints for any brand in the group, with 103,686 people contacting it over banking problems during the six months, while it also closed 348,700 cases relating to disputes on the issue.
But the group only upheld 12pc of complaints on banking, although it pointed out that the figure was distorted by the high number of cases relating to unauthorised overdraft charges, which were rejected after the banks won the test case.
The group received over 41,000 complaints about insurance products, mainly relating to the mis-selling of payment protection insurance. Customers who complained were successful in 54% of cases.
Lloyds Banking Group includes the Bank of Scotland, Halifax, Birmingham Midshires and Intelligent Finance brands. Lloyds TSB has around 12 million current account customers and Halifax, which was recently named the worst bank for customer satisfaction by consumer group Which?, has about 10 million current account holders.
Nationwide revealed that it received 90,200 complaints between October last year and April this year, and that it rejected eight out of 10 of them.
Customers who are not happy with the response they receive when complaining to their bank and who would like to take a complaint further can talk to the financial ombudsman.
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