You know that scammers owns telegram, and you would use an indirect means to find out the user name of the person in the forum that chat your clients, secondly you need to keep your telegram username hidden so that scammers will not claim that they're you and deceive your clients, you need to protect your image before scammers in forum ruin your business with your clients

Let me say it openly, many people who is in this forum are scammers, because what op explained here, it's people who is part of the forum that's messaging  different clients in order to defraud them.