This guy by the name of: Andre. Was going to trade with me. A knife on CS:GO. We used the "trust" System where I give him stuff to show that i won't scam and gives him confidence. None of that went well. After getting my suspicions of it he decided to hold my items hostage, 50 dollars worth of it. He then trolled me with it in his inventroy before eventually going offline and keeping it. Any advice/help?