Infinity Group — regarding job

Address: Mohali, Punjab, 16055

Website: infinti group,monster jobs

I got a call from this company that my resume is shotlisted for reliance jio tower technician and for that i have to come to their office for the interview and have to pay 3000/-for document verification and training fees.
I had paid that amount and give interview there on 31/8/2017. After that they give me confirmation letter for the interview on the same day and told me that my joining will be till 15/9/20117 and they will provide me job letter within 15-20 working days. But still they did'not provide me any letter whenever i called them they says that it will take 2-3 days and they will surely provide me job.
Now i am on no men land what should i do?
Should i file fir against them.
Plzz response me. And give me an idea.
This is the adress of that company:
Infinity group of companiesdate: 31-august-2017

E-122, industrial area, phase-7,

Mohali: 160055