Sachin Kumar Electronics — i brought a drone and it costs 20, 000 and i have paid him approx 4o, 000 he tells me again and again about tax.

I brought a drone and it costs 20, 000 and i have paid him approx 4o, 000 he tells me again and again about tax.
He tells me to pay delivery charges and custom charges that i already paid.
I have paid him all money and he again asking for more money
He again and again asking same money
He is doing fraud to me
He is not delivering my product and did not refunding me my money.