In reply to an RTI query, the Reserve Bank of India (RBI) said it has no data on the old 500- and 1,000-rupee notes used to pay for utility bills such as fuel at petrol pumps, which are believed to have formed a good part of the demonetised currency that returned to the banking system.
After the November 8, 2016 shock decision to ban the use of old 500- and 1,000-rupee notes, the government had allowed the exchange of the junked notes as well as they being used for payment of utility bills for 23 services.
Both 500- and 1,000-rupee

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