if they say they have been listed on the exchange then the step you take is to look at the exchange and see the volume there, if they don't have volume, there is still hope for volume to increase as the campaign goes on. but if it's not in the exchange it means that they are only in the name of the exchange. and we can be sure that it's a crap project
Never waste your time on projects listed on small and liquid exchanges. The price will never rise and you will not be able to sell it, I have been involved in many of the same projects but in the end I was unable to sell these tokens due to lack of liquidity.