According to the bank's statement, starting January 1, 2019, the old cards will be invalid. Once the card is blocked, as a safety measure, the bank will not unblock it under any circumstances.
The five localities checked for on the site were Banjara Hills, Madhapur, Somajiguda, Begumpet, and Afzalgunj.
The bank officials suspect the scam to be the handiwork of an insider as the debit cards are only accessible to the employees.
This is despite the huge reliance on debit cards by customers of SBI which services a fifth of the population.