Online fraud

I saw that there was an offer of 'Buy 1 get 1 free' on a foldable bag. After that I thought about buying it, on COD (Cash on delivery). But, I regretted after buying that bag, I thought there would be 2 bags, but I got 1 instead. And when I tried to contact them, they didn't received my call, or saw my message/email. Neither it gave my money nor gave another bag. I also got scammed, please, I request y'all guys not to believe in such scams on these type of social medias. From, Odisha