Always remember that Mods and Admins do not PM first so if anyone PM's you claiming to be an admin or mod, you should at first check the group you share in common with them and get the tagged so take that other members would be aware of their acts then you can block them from your end so they do not contact you anymore.
That sucks in a telegram channel. And it seems every time I get into a channel with a lot of members, not gonna take a minute and some stranger will message me copying the admin/mod name.
They'll start a conversation as if they're an expert and will eventually direct the potential victim into whatever platform they're trying to catch them.
We all know how it works at least for the experienced ones. But it's sad that many newbies are being targeted by them, the ignorant ones always get hacked and scammed by these people.