Grab Casesbd

3rd June, I ordered a phone case from “Grab Casesbd” Facebook page. The total price was 550tk including delivery charge. They told me to pay 275tk in advance and the rest would be after delivery..I did everything according to them. They said they would delivery within 4 days. And today when I knocked them in messenger they just simply blocked me from both Facebook and messenger. I realized I got scammed! I done know what to do right now, the money isn’t the issue here, what is the point of doing this in current situation, where is humanity!