Shenyang Timeet Import and Export Trading Co., Ltd/ Shenyang Daji Industrial Co., Ltd review: seamless titanium products not received

Our company "A and V Trade Corporation Limited" ordered the following material: seamless titanium tubes and plates on 7th of March, 2018. We paid the downpayment 30%. The delivery time was 45 days after received 30% payment. The Seller delayed the delivery time over 1 month.It ignored our messages, callings. Sometimes he answered, but it was unclear information. At last the Seller informed us that only one of the part of tubes was finished. They shipped this part to us. They refused to ship the plates and demanded to pay the balanced payment and after that they promise to finish the rest of tubes and ship the plates. We disagreed as the terms of the invoice were another. We tried to conclude the additional agreement(with terms are suitable for both Parties) with them dated 26th of November, 2018( but it was unsuccessful, the Seller did not sign anything).We have still not got the material or the money. The total sum of the debt is 9859, 8USD.