Grover Intern interview questions

I don't know how anyone can be this disrespectful. Right 40 mins before the planned interview time, I got an email that says my Interview is moved to another day. I still thought it is fine. But only 3 hours after that, they sent me an automatic rejection mail. I would not have felt this bad, if they have sent me a kind apology and a reason why they suddenly decided not to interview me. ......this is so disrespectful. I wasted my time to prepare and wait for the interview. As other reviews here are saying the same, they don't respect any candidate.