Tinker Federal Credit Union is sending a warning to about 8,000 of its members . It details a security breach that left credit and debit cards issued by the credit union compromised . They ll get a letter telling them that their card was on that list and that we want to be a protective as we can be of their data , so they ll get a new card , Matt Stratton said , a spokesperson for TFCU . He said thousands of Oklahomans will now be issued a new card and that will happen within two weeks of the letter . Stratton said it is the best way to handle a breach like this , which this time came via a warning from a department store . Stratton said TFCU moved to swiftly deal with the problem . But that does nt mean customers are nt upset . I mean , come on , you are supposed to keep peoples credit and important stuff secret , customer Greg Eggers said . In the age of identity theft , that does nt always happen . The number of transactions by credit cards is growing and that does keep us very busy , Stratton said . That means TFCU and other credit unions and banks across the country must stay vigilant . TFCU said any affected customer who would like to close their account may do so immediately and that they hope any customers noticing unusual activity will report it . ;