American Express India — incorrect late charge and interest

Address:

Thane, Maharashtra, 400607

My october credit card bill was due by 7th oct which i duly paid on the 7th oct. Bank account shows debit on 7th oct. There is also sms of debit on the same date. Despite this amex posted the payment on 11th oct and assessed a late charge and interest on my bill next month.

I shared all the proof with amex cs showing timely payment and still they refused to reverse the fees.in this era of digital payments where it takes few seconds to credit payments, amex is using fraudulent ways to make money by posting payments 4 days after actual payment date