Seagate Technology Process Engineer interview questions

Interviewed with six different people with 6 candidates total in a round robin fashion for three hours. It wasn't that bad and the time flew, the interviewers asked typical questions about your resume. They gave me an offer and a start date, even did a background check, I accepted. Then a week goes by and I get a call saying that the job may not be available as they are reviewing their open positions. This was my first job offer after college so I told my family and friends and put my two week notice in at my retail job. Then I had to retract all of that. That is a horrible practice for a company and I cannot stress enough, if this is how the company runs, do not work here.