HDFC Bank — debit card emi not eligible since last 9 months

Address:

Kolkata, West Bengal, 700157

Still not eligible for debit card emi while paying on flipkart, amazon via my debit card. This is not fair. While i can see i am eligible for consumer durable and debit card emi loan with pre-approved limit of rs.65000 on my netbanking offers section. Already called customer service regarding this issue but they do nothing, mailed them also many times.
Do the needful immediately..