Saint-Gobain interview questions

I was contacted by company recruiter and my information was forwarded. I was then scheduled for an hour interview to interview for both positions. At that time I was in the process of accepting an offer so informed them that I was no longer I interested.

A very unprofessional experience! I had applied for this position online. I interviewed with 5 managers, 1 engineer and 1 director. All one-on-one detail technical and behavioral questions. I received a written offer letter with a tentative start date in 3 weeks which I accepted. After 12 days I received a call that they have rescinded the offer. No clear explanation about the reason. Lost another option in the meanwhile.