Principal Financial Group Quantitative Developer interview questions

The team was impressive and highly professional; however, the recruiter displayed unprofessional behavior as she appeared to be unaware of how to send the completed file to the team. The submission was before Monday 6pm which was done from my end. However she only got back with me on the next day, Tuesday, which was so late saying that she did not receive my files even thought I did send from my end. I suggested that I could upload the work to a publicly accessible GitHub repository after our discussions lasting at least 1-2 hours, but I did not receive any updates from her. After three days, I followed up and was informed that I had received mixed reviews, which was rather vague. I feel that I did an unpaid internship since they used my solution but the least thing that they could do is get back to me and my assumption like they found another candidate internally hired.