How to recover payment from Foreign buyer or Importer

We are India based proprietorship firm, We basically are the exporter who mainly deals or export perishable & no perishable goods (Agro commodity Products) to UAE & other European countries, last year we made a deal with Dubai based Importer of an amount of 8K USD with DA payment terms (payment in 20 working days of Cargo Arrival at Jebel Ali port Dubai, U.A.E, as per PO we agreed upon), but still it's been around 13 months payment not received yet.For Last 13 months we are continuously following up with Buyer through whats-app & email and his fraud tendency is to always commit us a new payment date and when that payment date come he gave us another new date,this continuously happen from last 13 months, now we are completely worried about our export bill closure which means if our eBRC is not closed under DGFT system then RBI will charge us 30% or more penalty of an Invoice value, so If we have the genuine and strong evidences to show them such as what action we have taken to recover the money like FIR, Send Legal notice to the buyer, efficient email communication between both the parties etc only then RBI subside the penalty otherwise I have to pay the penalty and my export license got cancelled.Also during our email communication we have involved Dubai DED department, Dubai Chamber of Commerce,Dubai Embassy, Directorate General Foreign Trade (DGFT,India) and in DGFT portal we have also lodge a complaint against this buyer by uploading export related documents. Now I'm going through a tough situation, almost bearing 13.5 % interest of the funds that I have taken from the market for clearing their order and due pandemic our survival is getting difficult day by day and being in a middle class family with parents, kids and spouse bearing 13.5 % of interest is a very huge figure for me.Being a small business few things are thrown like a gum where my dues and uncleared bills are the major liability. Follow Up through calls and messages is not working in his case. All in all due to this my financially and mentally condition is getting worst day by day and I am not in position to keep giving that interest which is another liability for me. I would request you provide me some advice and what action should be taken and what should be the possibilities of getting payment from a foreign buyer.