Coolwinks — on a false promises of 100% cashback upto 2000

Website:

Coolwinks.com

I've ordered a specs with the order ID. CW[protected]. They promised me with the following terams and conditions.
https://www.coolwinks.com/offers/world-of-eyewear-sale/
The cost was 2251 and I was supposed to get 2000 back. Even after buying, I've called them for the confirmation of the offer. They said a yes for the cashback. After 14 days when I called them, they just denied with the cashback by mentioning that "I'm not eligible for the cashback."
Now even I can't return and I can't also get the cashback.
They have done this to many people. People who are aware of Social media have posted this with "CoolwinksFraud"
Kindly help me with this. A single resolution with the support of the consumers, will help many Indians to get their money back.