NBCUniversal Intern interview questions

The interview went really well and they said they will inform by next week but there was no response whatsoever for atleast 4 weeks and when I followed up they already hired someone else. It was not professional of them to not inform of their decision considering they are such a big company.

5 Minute presentation, 15 minutes of questions related to that and then 20 minutes of general questions relating to the role - the interviewer was very engaged and asked engaging questions