Legal Notice against cheque bounced

Dear Sir, I was a rural distributor of Pidilite Industries for district - Saharsa Bihar. I have suffered a lot due to covid-19. A lot of money was lost in the market due to which I was not able to pay the company on time. And still I am not able to pay the company. Some of my money is also deposited with the company in the form of credit notes. I have already sent 2-3 emails to the company to solve this issue but the company has not yet credited my payment to me. I have paid the company 2-3 times in between. For the remaining payment, send an email asking for time till March 31, 2022. But the company did not respond and deposited my security check in the bank. The check bounced due to insufficient money in my bank account. Now the company has sent a legal notice. The notice has asked to pay the payment within 15 days. Talking about going to legal proceedings if payment is not paid. My business is at a low level due to which I am not in a position to pay the company yet. What should I do now so that I get a few months to make the payment?