Hey Sarah! I'm sorry if you've had a negative experience with a TextNow user.
We do have a security team that exclusively works on catching, preventing, and disabling users who violate our terms or don't meet our sign-up requirements.
A true "bad apple", if you will, can sign up with a legitimate Google or Facebook account and still conduct criminal behaviour, however. At that point in time, we work with law enforcement to provide them with the necessary information to apprehend such individuals.
If you'd like assistance with a specific number, please feel free to contact us at firstname.lastname@example.org