PwC Senior Associate interview questions

I applied on their website and received an email from the HR for a connect. I got an interview with a Senior Manager later that week which went well and I progressed further for an interview with a Director. However, just before the scheduled interview, it got rescheduled and an interview with a manager was fixed. It went better than the previous interview, but I received a non-selection email the next day. That was a weird process altogether.

The first interview were with two hiring managers who clearly never had any intention of hiring me leaving me with very bad experience, why would you make me go through prepping for an interview when you've already made up your mind.