Wondering what was the explanation penned by the Chief Secretary to MOHFW in response to the fake vaccine scam in Kolkata

The fake vaccine scam in Kolkata was exposed on 2021-06-22. The Ministry of Home and Family Welfare (MOHFW) sought explanation from the Chief Secretary within 10 days after the scam carried out by a fake IAS officer Debanjan Deb came to light. 

Wondering what was the explanation penned by the Chief Secretary.