One comment in the Financial Solutions letter even echoes the advice from advocates and government agencies when consumers are considering turning to a private company for help: "Beware of companies that ask you to pay for services upfront."

Nonprofit agencies that are working with government programs to help homeowners in danger of foreclosure don't charge for the services they offer, and some states prohibit lenders from charging fees in advance of providing services.

Homeowners can call the federal government's Hope Now program at 888-995-HOPE, or visit http://hopenow.com to find legitimate assistance. The site has a calendar of free events around the country where help is available on site, and lists approved nonprofit counseling agencies nationwide that offer free help.

Details about government programs and counseling referrals are also available at http://www.makinghomeaffordable.gov.

The companies operating scams use a variety of ways to find their targets. Besides advertising heavily, they also search public records for default notices or mortgages written in the last few years by banks known to issue risky loans, and then send letters or make calls to those addresses.

Last month, the FTC filed lawsuits against five companies as part of a crackdown on mortgage modification and foreclosure rescue scams, the latest in a series of suits aimed at such swindlers. One of those companies, Federal Loan Modification Law Center LLP, generated 168 complaints to the BBB office in LA.

The FTC said these companies touted so-called guarantees and high success rates to mislead consumers about their services; charge upfront fees that legitimate nonprofit organizations do not charge; and use copycat names or look-alike Web sites to appear to be a nonprofit or government entity.

The agency also sent warning letters to 71 other firms "that are marketing potentially deceptive mortgage modification and foreclosure assistance programs." It would not identify those companies.

Some would no doubt be familiar to Crevina at the New Jersey BBB. He's dealt with at least a dozen companies that stopped answering BBB inquiries, and he now simply refers new complaints about them to enforcement agencies. "There are certain names that I hear and I know automatically how we're going to end up handling it," he said. "And the list is growing."

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Read More:   mortgages, recession, scams