Bro just apply with your details, put your Aadhaar card pin code in current residence pin code option and put your office pin code, then if documents are asked upload form 16 as income proof, don't upload salary slips because they demand form 16. you will get approved, select card delivery option on office address, i just got approved the same way on non serviceable pin code. Amex is now accepting non serviceable pin codes if you have a good credit history and eligible income in form 16.