PAR-TECH (MI) interview questions

After applying, receiving a project to do, going to in an person interview, and then receiving an offer signing and accepting it along with a start date 3 weeks out of their choosing, only a few days before starting I was told only that they were going a different direction and rescinding my offer. So after expecting to begin a job with a date they gave me, and halting my job search and interviews for more then a month, and declining another offer on top of it, they decided last minute to tell me they are going a different direction and take back their offer.