How to block a lost American Express credit card immediately?

I have had a hard time getting this card approved twice. The third time I applied after a 10% salary hike and got instant approval. Banks re-check eligibility every time. If you got rejected, improve your income proof / CIBIL and reapply after 6 months.

Credit score impact: each hard inquiry (which happens on card application) drops your score by 5-15 points temporarily. Applying for 3 cards in 2 months is fine IF you get all 3 approved. If 2 get rejected, you've taken a hit with nothing to show for it. Apply smart, not fast.

For the fee waiver condition: most banks count only retail purchases, not EMI, wallet loads, or fuel (in some cases). Read the TnC PDF linked at the bottom of the fee-waiver email — it's usually 2-3 paragraphs of fine print that change everything.