Freelancer — regarding payment

I paid rs. 500 for a project pdf to word. They said it's just a copy paste job. I paid and asked for the project but their freelancer account was temporarily unavailable. It is very difficult to contact them. They send me a number to paytm it. I messaged to that number but they didn't respond. Why can't this site can block this type of employers in the beginning itself. I lost my 500 rupees before even doing my project. I want it back. Please take some action and refund my money. It's easy for them to suck blood from others.