Flipkart — Disable cash on delivery option

Website: www.flipkart.com

Hello,
I have query regarding cash on delivery for my pin code.which I had been ordered by COD only.i have already spoken with Flipkart customer persons, they said like I cancelled/ return more product.that is reason they have blocked my disable COD.
I am a existing customer of flipkart.i have bought so many things but cancelled less product which was very cheap quality and size issue.there is clearly mentione that COD available for my pin code.once I came to payment mode then it is not taking same.do enquiry and please let me know the reason.they only disable my COD facility because other people who has belong my native place they can able to buy through COD.it has done by intentionally.