Fingersoft Infotech — cheating

They got 900 from me and gave the work materials and they are now not responding, since i have some doubts in working. They never paid me one rs also. Plese take action on them. They gave whatsapp number and paytm number to deposit amount of 900inr. But now i dont get any response from them. I worked hard for three days and i m not paidoff properly. Please help me.