People are very eager to call any service a scam if they aren't happy. The fact that the issue isn't with the service, but rather with they way it's used doesn't help: there's no reasoning with emotions. That's the reason why negativity is always louder.
You did notice the FB groups, however, the majority of the people who posted their complaints there either requested refunds of their exchanges (which isn't a Freewallet service, by the way: all exchanges are powered by Changelly.com) or sent unsupported tokens to our wallet. You probably don't know that we helped the majority of them as well. In fact, they have submitted support requests before posting their complaints, and their issues were resolved within the time frame we specified.