I am sure it is a scam. But remember getting listed on exchange is not the criteria that the project isn't scam.

Take the example of CREDITS (CS). They have raised a lot of money through ICO and it looks like their telegram is still active. But

- The same group of people of around 20 marketing team members are there who keep changing their names and it looks like they are very active
- They release the tokens without informing others and selling the supply and whales earning big chunk of money like that.
- Not listed on even a single big exchange.


So in my view even if a project is listed on an exchange, still it doesn't guarantee the credibility of it.

And the scenario that you gave, it looks like it is a pure scam.