GST fraud of 250 crores detected through IP address, single phone number using for OTPs of 12 firms. 27 year old Company Secretary arrested How CS arrested ? GST officers noticed suspicious patterns of multiple billings from the same IP address and OTPs sent to a single mobile number for different companies that had their addresses in various locations of Mumbai. The authorities analysed data and discovered a complex network of 12 fictitious firms that were registered under different proprietors and directors, but from a single IP address. The mastermind allegedly received operational support from the "company secretary" in Gurgaon, who was given a dedicated mobile phone where the OTPs to claim tax credit landed. The "company secretary", whose identity was withheld, was arrested, admitted to orchestrating the fraud.