Jaggery powder machineries ordered to Proprietor but failed to perform trail run & delivery 7 month

We from Karnataka Ordered automatic jaggery powder machineries to Proprietor Mr. Kishore Sathe in Latur dist Maharastra for 29 Lakh+gst. We found his profile in Indiamart.com in name of Sai Solar System. He had given offer to us to pay 16.5 Lakh as advance & remaining balance amount at the time of delivery of machineries in 6 equal instalment in post dated cheque. we agreed & he sent quotation in email & we accepted & placed ordered in email only. He suppose to make machineries using stainless steel 304 grade for product contact parts, perform trail run & show the performance to us & delivery in 45 days(1.5 months). We have transferred 7.5 lakh to his SBI SB account by 11-Sep-2020 & 9 lakh to his current account by 13-Oct-2020. But even after 7 months he didn't make complete machineries & instead made some jugaad by using old material/motor/pumps and which are half of full list of machineries & remaining 50% automation parts are not made at all. We visited the site but shocked that he doesnt have workshop, site, shed, infrastructure, labor which is clamed in Indiamart website. and upon asking he used gundas & started threatening us to kill, falsely claiming that everything is ready and harassing us to pay remining 12lakh+gst. He is denying to show performance of the machineries by trail run because he has confident that machinereis will not work as its failed. He actually did R&D of the automatic jaggery powder plant on our hard earned money. Please suggest how to get refund of the money or get all plant machineries with specifications with proper working condition by showing performance trial run. We approached to police station but they didnt take our case as he used his political or money power.