Before doing these stunts one should keep some amount due so that one can use last lifeline in situations like this.I don't think you will get a call after what you wrote here. Citing that RBI rule and "All bills have been paid already and no further transaction has been done", you don't say that if you need a retention offer imo.
Anyway even if the card is closed, it's not the end of the world. You can re-apply in 6 months. Let this be a learning and maybe ask in the forum before you proceed with such requests! 🙂