Insigma interview questions

Several interviews, one where they showed me the client database prior to me having a contract in place or me signing any NDA. They had to run background checks and get references. They were relentless with their emails to me and would chase after every email. Then, after all paperwork was signed and I was slated to start three days later, the emails stopped. I then had to chase them and ask what the next steps were. This was their reply. "We tried reaching out to the client regarding the start date. But unfortunately, they didn't provide any so far." That was it. They never reached out again, yet they have my SS number, background check, signed contract. It was the most unprofessional and highly suspect experience of my professional career. It all worked out in the end, though, and I worked with some excellent companies who are ethical and respectful of the person on the other end of the email. I would not recommend this company and am dubious of their intentions.