You have been successfully scammed if this friend is not actually your friend

An amount of 2698 USD has been transferred to a friend's account, and the money has been successfully withdrawn from my account. My friend tells me that the account is blocked, and the money has not reached me. I will not be able to open the account to see the funds. I have sent a complaint to the support center, but I have not received a response. What should I do? I want assistance to retrieve the amount back to my account. I need help.