The news that Wells Fargo secretly created over two million accounts generated outrage across the country.

Wells Fargo WFC, -4.33% said it regrets and takes responsibility for “any instances where customers may have received a product that they did not request.” It’s refunded $2.6 million, or an average of $25, to customers who were impacted.

But a look at a database of customer complaints finds that issues of account openings and closings are not limited to that bank — raising at least the possibility that the practice could go on elsewhere. The database, from the Consumer Financial Protection Bureau, shows over 30,000 complaints on the issue of “account opening, closing or management.”

Two senators, in a letter on Monday to CFPB Director Richard Cordray, asked whether the agency has looked into the question of whether the practice goes on at other institutions.

The complaints are against lenders big and small, and, not surprisingly, there are thousands of complaints lodged against the major institutions. Under the “account opening, closing or management” heading, Bank of America BAC, -2.93% had the highest number of complaints, at 4,901, followed by Wells Fargo at 4,450, J.P. Morgan Chase JPM, -3.09% at 3,169 and Citi C, -2.07% at 2,260, a MarketWatch analysis has found.

Representatives of Bank of America and Citi declined to comment, and J.P. Morgan had not returned a message.

Also read: It’s business as usual at Wells Fargo after record fine

It’s important to stress that a customer complaint doesn’t mean the bank is at fault. And there’s a vast array of issues that could be included under the category heading of account openings, closings and management. The CFPB database only occasionally has a “customer narrative” that explains the issue at hand.

One common issue seems to arise when a customer closes an account, but then a check written from it is cashed. The bank honors that check, which forces the account to be reopened. Another source of customer anger is when an account is closed by the bank for inactivity or negative balances.

There was one telling “narrative,” however, about Wells Fargo.

A customer last year reported an incident in which a teller tried to get the person to reopen a savings account previously opened without permission. “I may not have looked like it because I was dressed in shopping gear, but I work for a bank myself and I know a little about deceptive practices that some individuals use to meet their sales goals. If I did not have inside knowledge, I may have once again fallen victim to these deceptive practices.”

That particular complaint was labeled “closed with explanation” by the CFPB.