Reaction Search International interview questions

I had the standard first interview at their office. They sent an assessment after that then i got invited for half day trial. After the trial, they completely ghosted me. I left voicemails and sent follow up emails and no response. I think this is very unprofessional. They did not have the courtesy to let me know I have not been selected even after my multiple attempts of reaching out. I had to take off time from work for the half day trial and I have been professional all throughout the process. I guess a little professionalism is too much to ask from them.

There was a 3 stage interview process, the first being an appointment scheduled during my college's career fair, then I had a call back interview at their office and then I filled out paperwork.