According to the complaint, in July 2003 SFCU agreed to provide financing for TCN customers.
In January 2014, however, TCN began failing to repay SFCU for delinquent loans, according to the complaint.
"In those negotiations, TCN never informed SFCU it was insolvent, a necessary piece of information for SFCU to consider in determining whether to continue the relationship," the complaint said.
Those difficulties apparently surfaced again in October 2014, when TCN began failing to repay loans that customers canceled, SFCU claimed.
In total, the bill is now $12 million and rising, SFCU said.
SFCU said TCN is the credit union's largest book of business.
SFCU also claimed TCN representatives told customers they didn't have to repay the loans and that their loans were canceled.
"This results in TCN keeping the money it has been paid under the (subsequently canceled) loan, SFCU being out the same amount, and the consumer being reported as either having a loan or having a loan past due because SFCU was not notified by TCN of the loan's cancelation," according to the complaint.
Shafai said SFCU plans to begin rolling out the Geezeo functionality this fall, introducing in phases such features as budgeting and planning tools, financial decisioning articles, alerts available through everything from e-mail to RSS and text messages, and, of course, aggregation.
Shafai, who describes himself as "a big fan of Twitter," said SFCU has seen a growing need a robust social networking presence as the 47,000-member CU approached and then passed the billion-dollar mark.
It's been a pretty costly endeavor with rather dismal results in terms of gains realized for investment made," the SFCU e-commerce executive said.