TCS interview Review

So i got an email from the hr for the video interview in TCS. I shared my interest in the same. They schedule it for a particular time frame . The Hr confirmed my availability over the call one day before but i never received any video link to join for the interview. I mailed the recruiter but no response from them. Why is interviewee time not considered important . I took a half day off for this interview and at least I deserve one email if i was rejected last minute or the interviewer is not available or any xyz reason but I deserve that.