You can downgrade your saving account by visiting nearest ICICI bank branch in person. All you need to carry is your KYC documents with original copy.
If account is joint account, all account holder have to visit with their respective document.
We request you to follow the below mentioned channels to activate your Debit Card for international usage..
Internet Banking :
Login to www.icicibank.com with user ID and password > Go to Customer Service > Service Requests > Bank Accounts > Debit Card Related > Increase/Decrease Debit Card Limit > Complete your request by entering OTP sent to your registered mobile number and grid values of your debit card
Click here to navigate.
Mobile Banking:
Login to ICICI Bank iMobile Pay app > Click on Services > Card Services icon > Click on Modify Debit Limit > Enable International/Online transactions