A bit suspicious of the hiring process - Customer Relations bei Rexair: Mitarbeiterbewertung

I applied online took about a week or so. I got a called from one of the hiring managers. Everytime I call back the number was busy which was weird.They sent me the incentives,benefits and hourly offers that too good to be true. I ask on the phone for a complete job description before I attend the interview. They only sent me the 'field' description along with 'pay' description. Nowhere did it describe what duties i would be doing or what I need to do. They even mentioned interviews are two weeks out and to expect 2 hours for the interview.