OCHIN Personal Trainer interview questions

The initial interview was roughly 40mins and it went well. The HR manager asked questions in regards to my experience and gave details about the position. I had all of the qualifications for the position. She stated that I would be a great fit for the position and that she would be in touch with me in a few days and to keep her updated if I received another job opportunity prior to her reaching out to me in regards to the second interview. Once the interview ended and we got off the zoom call, I checked my emails and noticed she had sent a rejection email during our interview. I emailed her and ask was this in error and she never responded. I thought this was very unprofessional and unethical, it was a very bad representation of the company. You should never mislead a person in thinking they were going to the second phase of the interview and then send a rejection letter during there interview.