Business loan and personal loan given

On Feb 2019 we met Mr jeenupati Raj kumar for electric auto business and Mr j Raj kumar motivated us to start for electric auto business at kakinada Andhra pradesh , so he told us for auto delearship we need to pay him 8 lakhs and we have paid him 8 lakhs through bank transaction and later we came to know from direct e auto manufacturer that dealership is given for 1 lakhs ( we found that Mr Raj kumar fooled us , this we came to know in 2020, and in June 2019 he requested / begged for more 8 lakhs as loan on returnable bases in dec 2019 at the time of show room opening , we opened show room in dec 2019 and we did not receive any amount till date 08/10/2020 , and business also did not run at all as Mr Raj kumar was interested to open another person's on various locations of Andhra Pradesh and in June 2020 total business is close , all e autos has been taken by Mr Raj kumar, in June 2020 we have discussed about our money and Mr Raj kumar Agreed to give us 15 lakhs back and he gave us 3 ICICI bank cheques , in which 4 lakhs will be given to us on Sept 2020 , on dec 2020 5 lakhs , and on March 2021 6 lakhs he will settle our amount but on Sept 2020 cheque for 4 lakhs was cheque bounce , now we went to ask for our money but Mr Raj kumar is saying he will return our money , but he is least bothered .but we have taken promisery notes for each cheque. Sir , How can we fights legally with mr Raj kumar to get our 15 lakhs and we came to know that Mr.Raj Kumar is having one duplex house in his name but the house is on finance/ loan from repco bank Please suggest us. Please contact me on email [deleted]