Publix interview questions

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.

I applied online and I showed up at the job fair in both March to learn about the company and April to actually do my interview. It was for a new store they are opening in Rolesville.