HelloFresh Packaging Optimization interview questions

I applied online via a post I saw on LinkedIn on the 20th of March. On the 1st of April they reached out for an interview which was scheduled for the 7th (due to Easter). The interview seemed to go well because on the same day the interviewer (btw. not a recruiter) gets back to me, to schedule the next phase which was an Excel test. We schedule it on the 9th of April. On that day it arrived on my email, I did it on my computer, and I sent it back as instructed. I kindly asked to be informed if they received it. I got no answer. After one week, on the 16th of April, I send one last email to my interviewer to ask how the process will be moving forward. I got no response from the person. On the 20th of April I receive the generic email that rejects me with no information regarding the role they reject me (I had applied for one more position) or any feedback about those two stages. Overall I am disappointed because I would appreciate the person with whom I had the interview with to get back to me with the rejection and some (whatever) reason.