Tanishq — Digital Gold exchange

Dear team,

I am planning to by 20 grams of Digital gold from Tanishq in next few months (which is already started). Today when I spoke with customer care, they have informed me that I need to pay the GST for the Digital gold as well as at the time of physical exchange at any of the Tanishq outlet too, which is directly twice payment of the GST.
Kindly confirm on this, why customer should pay GST twice ?

Regards,
Prabhash