Flipkart — No cost emi was not applicable

Address:	Bangalore, Karnataka, 560034
Website:	www.flipkart.com

I purchased an iphone 6s 64 gb from flipkart for 40, 699 INR with an offer of no cost emi but after making the payment i came to know that they are not offering me no cost emi because i have already purchased another product on emi on the same SBI credit card. But i went through all terms and condition on their website regarding no cost emi and no where it was mentioned that you can't avail the no cost emi offer more than once.
My order ID is OD[protected]
Flipkart executive told me if you want you can call bank customer care to cancel the emi and convert it to normal payment. But instead bank executive told me clearly flipkart is at fault we can't cancel the emi and you have to pay interest of 15% plus 4% processing charge for the amount of 40, 699 that in turns out to be around 4000.
Flipkart executives are giving now excuses saying that no cost emi offer was applicable when you placed but i made it very sure that the offer was applied when i opted for credit card payment and it was even showing me how much i have to pay monthly for 12 months emi ie ( 40, 699/12 ) without any interest.
After i completed the payment they are telling me that no cost emi offer cannot be availed if you have already availed the offer on the product prior. but they should have mentioned that in terms and conditions if so. The executives themself told me that yes the point was not mentioned in terms and conditions. I asked them so who will pay that[protected] approx extra money? so they are like we are sorry we can't do anything about it.They are not ready to help and now i am at loss of[protected] approx.
Help me this this issue. I have been contacting flipkart almost daily. No proper reply and no help.