Amazon India — payment terms

Address:

Gurgaon, Haryana, 122016

Please note down my issue

1- i have placed an order with prepaid type but order is automatic converted into cash on delivery,
2-the link you have provide to update payment is not working, as already try for payment with taking on call help they are not able to understand...
3-as per rathipriya guideline i also add whole amount to my amazon pay balance. But she disconnect the chat,
4-i have contact more than four time also conversation held with senior one but every one telling me different different thing,
5-one resolution that i want for my order in written that is i simply want to pay online i am not able pay cash while i have already added amount in amazon pay wallet,
6-i don't want to cancel my order because all order in offer time and also i am expecting the product will deliver tomorrow,
7-amazon executive thinks its not bigger payment that's why they are not taking serious but i am taking this issue for me my friend circle,

Its too difficult shop online with amazon, also difficult to operate app and follow link...