Over 9,500 such complaints were pending against various banks, it said.

The revised 2006 Banking Ombudsman scheme, applicable to all commercial banks, regional rural banks and scheduled primary cooperative banks, provides a forum to customers to seek redressal of their complaints relating to credit cards, house loans, promises given by the banks' sales agents and delay in delivery of services.

It said the number of complaints pending for resolution as on December 13, 2015 was 9,508.

"There must be a time limit for resolution of the complaints received by banking Ombudsmen so that customers are not harassed further," said Ajay Dubey, an anti-corruption activist.

The number of complaints received by Banking Ombudsman across the country from January 1 to December 13 this year, was 87,683, the RBI said.

As per RBI's annual report 2014-15 on the scheme, a total of 88,438 complaints were handled during the fiscal. Of these 84,660 were disposed off. Interestingly, 87 awards were issued by the Banking Ombudsmen during the year.

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