AVOID SUCH FREE OFFERS
(INTEREST FREE OFFERS)
Practically, treat CCs as Convenience Cards - replacement for carrying cash. NEVER keep any amount outstanding n pay IN FULL about a week before the due date.
READ completely and understand the examples they give in the monthly statement on part payments or MAD.
Even if One Rupee is not paid by due date n is outstanding, then, all the subsequent transactions are ALSO treated as in default. And, attract interest.
So, BE CAREFUL and BE FULLY INFORMED about the way they charge MAD n outstandings.
Better be safe than sorry.