There is no correlation between the title of your question and its content. To learn about any credit card offers, please refer to this post:
https://fincuss.com/topic/46/any-offer-on-hdfc-credit-card/2

I have faced a similar problem with another private bank. Do one thing: collect all your documents (account details, transaction proofs, complaint letter, ID proof, etc.) and all communication records before submitting your complaint to the RBI. RBI will resolve this issue in 30-35 days, as my issue was resolved in 30 days.

While doing international transactions, most banks impose a transaction fee, typically a percentage of the transaction amount. The card's terms outline all these details, which I'm sure they have already explained to you. However, if they failed to disclose these charges to you during the credit card application process, it's advisable to lodge a complaint against them.

The RBI established the strict policies to manage foreign exchange, following KYC/AML rules and ensure that cryptocurrencies remain outside the main banking system of India. The future of cryptocurrency in India is still uncertain.