TOKYO — Former employees of Seven-Eleven Japan Co.’s franchise stores on Wednesday gave vent to their anger and frustration on social media over the company’s handling of unpaid overtime wages.

Japan’s largest convenience store chain said Tuesday it did not pay a portion of overtime wages to at least 30,000 workers, totaling some 490 million yen ($4.5 million), after March 2012 due to a miscalculation in its payroll system. It said records only exist from that month onward.

Still, the company admitted that the problem dates back to its founding in the 1970s and promised to provide all the unpaid wages before March 2012, if the former employees can show their pay slips or other proofs of working records.

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