Adyen interview questions

Went to an in-house day at the company, where we did a workshop in finding fraudulent payments. There was a company drink afterwards. The next day, I was asked, by email, what I thought would be the possibilities at Adyen and what my availability is. I replied to this email and have not heard anything from them since, even after sending multiple reminders and calling them asking what the status was. I have yet to experience such an unprofessional HR department, where emails and phone calls are ignored and people that don't get an offer are not informed of this (others didn't hear anything for months, even after going for an interview). It is apparent that the company is growing at a high rate, but they will not be able to keep up with hiring people if this is the HR department that is in charge of that. Very unprofessional.

Lengthy process. A month from application to scheduling the interview. The interview was conducted online for about 30 min and since it was a referral the recruiter took longer to communicate the rejection.