Citizens’ complaints to the state-appointed bank ombudsman increased 30 percent in August and September, and in most cases the ensuing investigation found in favor of the complainants, according to data released yesterday. The bank ombudsman’s office attributed the increase – which considerably surpassed the corresponding rise in complaints in the first half of the year – to a large degree to the collapse of a diet company many of whose clients had been paying by credit card. So far this year, the ombudsman’s office received 5,020 telephone complaints and 725 in writing. Overall, most complaints concerned credit card payments. Matters regarding loans came second, followed by complaints regarding deposits. The ombudsman’s office said it had found fully or partially in favor of bank clients in 80 percent of all cases.