Coolwinks — cashback not credited

Address:	SF/F-7, Durgachak Housing Estate, Durgachak, Purba Medinipur, West Bengal, 721602
Website:	coolwinks.com

Hello sir, coolwinks didn't give me rs.1000 paytm cashback.
Order id:- cw[protected]
Order total:- rs 4704.
Payed by paytm - rs 3329 (After deduction of rs 1375 coolcash.)

I had ordered spactacles after seeing (Flat rs.2500 paytm cashback offer banner, rs 1500 cashback will be given within 24 hours of placing order and rs 1000 cashback after 14 days from date of delivery)
I
After ordering i received rs 1500 cashback. My order was delivered on 6th june. Even after 14 days of delivery i didn't receive the remaining rs 1000 cashback. So i contacted customer care, they said i will get only rs.1500 cashback because i had used coolcash while ordering. But in terms and conditions of the offer there was not written anywhere that i cannot use coolcash. Besides in the payment page it was clearly shown that i was eligible for the offer. They are not taking return too saying that return period is over.
Please look into these. I need either cashback or i want to return it
Thank you.