portable toilet purchase froud

I made a deal with online marketing for a portable toilet for 15000 rupees, they told me to do 6000 ADV first, I did it with UPI, he forced me again. I asked to make the payment, I did that too, later whose receipt was also sent, then the call came that the machine is not accepting the payment so bar, you make 15000 payment at once, I got suspicious, I refused and asked to refund the payment, he asked me to get an update in two days, he asked me to get an update in two days, when I called, he said no. Blocked and blocked. There was no contact after that.