Who would know a Telegram user with username Jesse Cooper? I don't know how they found out that Alex gave me a job and what link they have. This particular individual actually tried discouraging me from doing the job after receiving payment from Alex.
You don't need to find out about the Telegram account other than just waiting and If your story is true then you don't need to tell anyone about the agreement that has occurred as well as the funds that have been sent to your wallet unless someone contacts you and can prove that he sent the funds so that work can continue, and you are not the party is at a loss so reporting it to the police just with the evidence you have will not solve the problem, so just wait until you contact you again and can prove that he was the first person to contact you and of course you have no right to use the funds until everything is clear.