JC Consulting interview questions

Well the first interview went smooth and very well, after the interview was over the two analyst who interviewed me told me they would get back to me within the next week or so whether or not I got the next interview. I waited and waited, about three weeks go by with me emailing to ask what is the next step, im very interested in the position and so on. then the HR rep emailed me telling me I was chosen for a second interview and I was excited but a little let down, how could a company wait so long to tell me this. It wasnt a big deal, so the day of the interview comes along and I got ready for it (it was over zoom thank god because it didnt take me that long to) and five minutes before the interview the HR rep emailed me saying they had to cancel. and said they went forward with another person without even giving me my chance to interview. I was very angry at this time but I kept my composure and said thank you for the opportunity and have a nice day. looking back on it I am glad they did not hire me because I do not want to work for a company who treats their potential future employees like this, who knows how they treat their employees??