HotA - General Questions and Discussions

Hello. The following issue occurred: during the game, the online lobby started to crash, and during the final match, it froze completely. I messaged my opponent, restarted the game, and added him as a friend to check the online connection. After two messages, the "friend" checkmark disappeared, but I could still send messages. I believe my opponent added me to his blacklist because he didn't respond to the messages and didn't log into the game with the saved game. How can I contact him and finish the match? My opponent's nickname is ХАОС_86, and mine is YarMoLight. Please help.