Indian Army — Quikr fake product

I saw a post for AC and fridge sales on Quikr website and I reached out the contact person. The mentioned that he is a CISF person, selling the thinks due to transfer. Then requested to send booking amount . So he shared some identity proof for confirmation. After I paid the amount he mentioned that those thinks are parcelled and will be send through Indian army courier . And later he shared some billing details . And shared a delivery person number. After talking with him, he again asked to send GST amount to proceed with delivery . So I talked and asked to cancel the order. But they are saying they can’t cancel the order without paying GST amount of 8000 . I enquired about that and now they are not responding .

Seller : Name - Randip Singh, +[protected]
And delivery person - Advesh Kumar, ‪+91 92573 61269‬
Request to send money - [protected]