Advertising Standards Authority Limited interview questions

Had two rounds of interview with the ASA, the first a screening kind of call with the manager of the role, the second more of a technical interview with the same manager and a colleague - it would have been good to have known beforehand that this would involve some mathematical questions. I was ghosted after the second interview and only heard back 10 days later after I had to chase for an update. Comes across as unprofessional to leave candidates in the dark, and likely speaks to wider company culture.

This is a very rude company, they sent me an email to ask about my available time slots for an interview, I replied to them on the same day with which time slots I was free, and then I didn't get any response, and after I sent another email to ask, I still didn't get any response, I don't think this is a polite behavior.