CarGurus Sr. Software Engineer interview questions

I was approached by the CarGurus sourcer on LinkedIn and then introduced to a recruiter. Initial phone call went well. Had a phone screen with one of the engineers on the team. Cleared it as the questions were very easy and was asked for availability for onsite. They have 2 virtual rounds and 2 in person rounds. For the 2 virtual rounds one of the interviewers wasn’t prepared well. She had some weird question and when asked for clarification she kept blabbering about the use case instead of the intrinsic details of the problem. For the in person onsite they asked me for the availability and after confirming I couldn’t attend due to health reason and respectfully asked to postpone the date. I was given a new date but this time again postponed due to a team member not being available. When I asked for new date, I didn’t hear back from them for a week and later received a rejection email. Very unprofessional behavior I must say.