Sen Finance/CapRock international LLC scam

Sen Finance/Caprock International issues a signed and sealed contract to supply products they said they had available at a price. They locked in the contract for 12 months and was signed by all parties. We issued A Letter of Credit to their assigned bank TO COVER THE COST OF THE PRODUCT. after MONTHS OF DELAYS THEY FINALLY issues a Proforma Invoice ( which proved to be fake). Again more delays and than they came back to us with a new price some 90% more than the contract price and told us to take it or leave it..They still have our LC in their bank. When we check with the local supplier they said they were going to ship from the supplier said they had no deal with them or have product available. We have lost faith from our customers and due to contract we signed with our customers we are at a lose of more than $30,000 in fines plus several orders of lost profits