Sky Blue Finance — Want to refund my money

Address:

6/4/4/2 seals garden lane , cossipore. Kolkata 2

One day I got a call from sky blue and told me that my cbil score is good and they will provide me 1lac to my account and they send me some documents to my email address aa a pdf document . Where were mentioned that I had to pay Rs.1500 for security money and Rs.4000 for GST . After paying those amount they send me security deposit Rs.15000 and I denied to pay them . They told me after one month they will return back money to my bank account . Then lockdown was started . After lockdown I called them and they told within one month they will refund me in July 2020 . But still now they didn't pay me and the customer service number aslo switched off. Now what will I do ? I am Anirban Mukherjee from kolkata westbengal .