Filtration Group interview questions

**BEWARE** Their recruiter reached out to me on LinkedIn to apply. Interviews were: 1 w/recruiter, 3 on-site to meet the people on the team I'd be joining. There was also a case study (more of behavioral questions + IQ-type questions format). I went through the whole process and offered the role but THEN, they tell me they actually don't have internal approval for the role/won't be hiring anymore. Absolutely unprofessional and complete waste of my time. Why recruit and gather candidates for a role that isn't even approved by the company????????

The questions were mostly behavioral, and they asked a few questions on what I've done in the past for engineering projects. There were some logistical questions too about how I would get to work.