I attended an interview for marketing with this co...

I attended an interview for marketing with this company. The first round was an online assessment which I pulled an all nighter to complete. Then, after a week they called for the 2nd round of interview. The marketing head took my interview for 2 hours along with another written assignment. After this, HR gave a weird Thank you note for the interview. They said surely they will call back for a final round or email if rejected. They didn't have the courtesy to respond. I am also sure, that they have taken free marketing consultation from me during the interview. This is extremely unprofessional. Thanks for wasting my time.