Publix interview questions

Met for a quick interview, very casual. Talked on the phone prior to getting an interview. Was one on one with the hiring manager and completed necessary paperwork at the time of the interview.

I was offered an interview, and 5 day before the interview, they canceled my interview with a notice through email on their site. In my opinion, I find this highly unprofessional and very unethical. If there was concern about how many people applied, an interview shouldn't have been offered.