As per the GST ruling, merchant can only charge GST on valid transaction. Any transaction which is cancelled/reversed , merchant has to reverse the GST amount aswel. In my credit card statement GST is not being reversed on cancelled transactions. Informed the bank but they denied. Asked them to share the ruling they denied. Checked with other banks they reverse cancelled transactions.. While my amount is not much but in larger scheme of things all HDFC customers are impacted due to this incorrect accounting and the impacted amount will be in crores..