The chain, in addition to reimbursing the rewards customers, also paid a civil penalty of $46,650 while not admitting any liability or wrongdoing and cooperating with prosecutors.
The district attorney's office learned about the overcharging in fall 2011 from a customer who noticed a discrepancy between what a gas receipt from the Hamilton gas station showed and what was charged on her credit card bill.
The discount price for her gas, when she used her rewards card, showed up on the printed receipt from the gas pump but not on the credit card bill she received later, Allen said.
According to Allen, the investigation revealed that a new but faulty software program would infrequently trigger a disruption and cause the undiscounted price for gas to be charged to credit card companies.
According to Allen, prosecutors found out that the glitch was also at Safeway gas stations in Pleasant Hill and Palm Springs that used the same software, Allen said.
While more than 700 overcharges were evident at the Campbell station, less than 30 erroneous sales took place at each of the Pleasant Hill and Palm Springs stations, he said.
Allen stated that Safeway repaid the customers by issuing credit to their rewards cards equal to what they were overcharged, Allen said.
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