Sattlement of loan amount

I purchased a commercial bolero from OLX on January 6th 2020 and the final price we deal at 5.5 lakh but due to shortage of money we deal with him that we vl pay 4.5 lakh now and the balance amount we will pay within one year and then we did one simple sale deet in stamp paper , and after 2 month Corona lockdown started or else we thought we vl clear within 2 month , but coz of corona we could not clear the balance amount , and he was a business man having wholesale shop and I trust him coz he is a business man and the money which I pay to him he didn't clear the loan and when the time came to clear my money in the month of Jan I called him it's switch off and I call next to his shop she said he suicide and the shop is closed from September I was shocked and then I came to know he didn't clear the loan and the loan amount is 4.3 lakh and no body of his family member is here and they don't know anything about this car matter and now bank have seized my car and saying me if u want clear the balance amount but we request a later for comprising the loan amount but till now they make us waiting saying they have to discuss in head office so what shall I do sir please suggest me..