Applied online, received email from HR for intro interview followed by coding test to be completed within 5 days and submitted and then another interview after with team that would be working with

I had my 1st interview with the company's recruiter, which went well, nice and friendly, and then I moved on to the interview with the hiring manager which, again, was nice and friendly and I was asked to do a test task, which consisted of elaborating a decently extensive business case. I delivered my business case ahead of time and I proceeded to hear nothing from the company for almost 2 months. In that time I sent 4 emails asking for some feedback on my business case and how the process was going and I got only 1 reply saying that they would inquire with the hiring manager about the status of the process and would come back to me and then 3 weeks went by without any more updates. After this I was sent a generic rejection email, still without any feedback about my performance and business case, saying that they chose a different candidate for the position and encouraging me to apply again for HelloFresh in the future. Absolutely dreadful and unprofessional behavior from this company, just blatantly making me waste my time. I would advise anyone interested in working with them, to avoid this company at all costs because professionalism and common courtesy are clearly not of their concern.