Cognizant Senior Data Engineer interview questions

I was contacted by a recruiter who scheduled a first round interview. The interview itself was straightforward, mainly focused on going over the details in my resume. After the interview, I received an email saying the interview had been cancelled and would be rescheduled, even though it had already taken place. This was confusing. I followed up with the recruiter multiple times for clarification, but I received no response. The lack of communication was extremely frustrating. Candidates deserve basic respect and transparency, especially after taking the time to attend an interview