Seek legal help to fight your case. And in parallel, look into accepting and promoting Bitcoin payments for your business.
Heck, Bitcoin is even becoming more and more popular among B2B business suppliers (according to BitPay CEO https://medium.com/@spair/the-bitcoin-fee-market-4df1857d12b...). So if you start receiving BTC payments from customers you may use them directly to pay your suppliers without even converting to USD.