American Express India — Credit Card delayed Payment of Renewal charges affecting CIBIL Score

I was corporate credit card user of Amex then later Amex offered me personal credit card with no annual charges which i used for 2 yrs. After 2 yrs they charged me Rs 7500 as annual charges. As i have not spend any money i thought it would be error. After 1 month i was started getting reminder email to pay the amount. Later i found that it is renewal charges applied to my credit card. They have not even sent the single email on card expiration date and renewal charges applicable for next year use. After i asked them to close the card they reversed the amount but didnt close the card. after 6 month my CIBIL score dropeed by 175 point due to non payment of credit card for 60+ days. When i inquire amex they said card is still active. Now they have closed the card but CIBIL score is been hampered. They are not ready to discard non payment of card for 60 days. My query is if you are charging individual renewal charges formal communication before renewal should be sent and should provide enough time to take decision on Card renewal. By simply charging the amount to customer account doesnt make sense and they need to be penalised for their mistake