What legal steps can I take to recover unpaid debts?

Supplied goods to a creditor on the agreement that payment would be made within one month from the date of supply. These supplies were made over a span of three months. However, the creditor has now defaulted on the payments. Despite my continuous emails and calls, they have responded by claiming that their company is in a financial crisis and cannot make any payments. I even sent a demand notice with all challans attached. I continued supplying goods despite their unpaid dues because they begged me not to stop, stating their factory would shut down without the goods. Their directors personally requested that I keep supplying, promising quick payments, which led me to continue, understanding their situation. Now, they have informed me that they won’t be able to pay until their financial condition improves. As a small wholesaler, this significant loss is unmanageable, and it's creating a financial crisis for my family. What steps should I take to recover my debts? Please advise.