Buying glasses from Coolwinks.

Dear friends, I am not sure whether creating a new discussion topic is the right thing to do but I am doing this after going through all the search results and not finding an answer. What is the current best way to buy glasses from Coolwinks? As in the most viable/profitable way. I had previously bought glasses with 1600 cashback on paytm and technically only spending 200 Rs for 3 pairs of glasses towards 2018 end. My power has changed and all the 3 glasses are such that new lenses can’t be put.I have another paytm account at home. Are there any good offers to buy 2-3 pairs of glasses, hopefully under 2k? I travel a lot and have to keep spare. Lenskart has become costly and I don’t know anyone with a membership. The glasses from Coolwinks were fine. Please help. I would like to know the cheapest and most viable option to buy these