West Bengal govt is giving wheat to Flour Mills for milling/crushing and the resultant fortified Atta is supplied under Public Distribution Scheme. No GST is charged by the Millers since inception. Now the GST officer has issued summons u/s 70 of the CGST Act, 2017 to furnish all records and appear for hearing. There are about 100 millers, none of them has realised GST. Seek expert opinion on applicability of GST, if yes, the rate and whether the previous GST can be realised from the Govt of West Bengal.