Snapdeal.com — Cashback not credited and now snapdeal showing tnc

Address:	380015
Website:	www.snapdeal.com

Hi,
This is with regards to purchase of Philips JMG in Nov 2015 through P.o number : [protected]
I had purchased it online an at time of purchase attached 2 complimentary offers
Offer 1 -- 10% Cashback if payment made through HDFC Bank
Offer 2 -- Free charge coupons
Unfortunately none of the offers were credited however upon notifying Snap deal Team, free charge coupons were credited and I was informed that 10% cashback will be credited to HDFC Account in Jan 2016.
There was no amount credited back till 18th Jan 2016 hence I wrote to Snap deal Team along with screenshot of complimentary offer and they came back informing that as per their TnC, cashback was to be credited only upon purchase through Snapdeal App and not Website.
This was not acceptable since while purchasing, there was no such specification NOR was there any notification to refer detailed Terms & Conditions and hence a customer would look forward to what was reflecting and promised while making purchase.
Please refer screenshot and help me get resolution since Snapdeal customer care has clearly informed that they cannot give cashback credit as it is website purchase which is not acceptable since attachment itself talks about their only communication while purchasing