Thats really annoying.
Although telegram is one of the best app to get updated information about crypto currencies projects but many people misuse this and pretend to be the owners of certain ico or other famous persons and demand money from them in return of some investment or schemes. Newbie traders or those who are recently involved in bitcoin easily get trapped by them and they scam money from people.
Well, In every social media platform, it happens. Even on facebook and twitter, there are various scammers that are waiting to steal your money. If there are ignorant peoples then scammers will be lively scamming everyone. If you're willing to enter trading, you should read info that will avoid you to be scammed.