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I am unable to change my account currency. Right now it is selected as USD and I can't change it to anything else. It is greyed out/locked. I can't select it to change it. Even after logging in to the website I am unable to change it. Please help.
I don't think anything other than USD is supported by GOG in India?
The currencies that we support are AUD, BRL, CAD, CHF, CNY, DKK, EUR, GBP, NOK, PLN and SEK - which are available in supported countries -- and also USD, which is available everywhere.
https://support.gog.com/hc/en-us/articles/212184449-What-payment-methods-and-currencies-do-you-accept-and-where-?product=gog

Doesn't appear as those the Indian Rupee is supported as a currency on GOG, so you default to USD pricing.