TikTok Partnership Manager interview questions

I applied on their website and had an initial screening with the HR . After a week, I was interviewed by the hiring manager. This was followed by two other interviews; one by the a higher ranking manager and an employee from a different department. Then I was ghosted after 4 interviews, never heard from them again.

Interview process was very weird. After my application they just phoned me and i had one phone interview with HR lady. After that i met with hiring manager. 3rd process was with head and after this process i couldn't get regular communication. I called and mailed them twice. After 3 silent weeks they called me, okay we will send you the case study. My case study went very well. (They said it actually) After that there was only silence. I sent several mail to hiring manager and hr team. They didn't reply me. After 2 months from the case presentation, i recieved a reject mail. Guess what? I asked for feedback, but they didn't reply again.