CarGurus interview questions

I applied for AE role in Ireland and initially had a call with recruitment team in Boston which went well, They asked about experience, why cargurus etc.. I then was set up for 3 back to back 30 minute interviews with Sales dircetor, team leader and finally sales manager. The first 2 went well, like most sales interviews there was a good structure to them but the last one didn't really seem like they knew what to ask.. They just kept looking around and then would say "emm tell me about this" or that! No structure at all and seemed like didn't want to be there! I asked for feedback at the end and was told it was a good interview and that there was a couple more people interviewing for the role. The thing that annoyed me the most however was that after taking the hour and 30 minutes to do the interviews back to back that I wasn't even sent one email or got one phone call to say if I was successful or not, completely wasted my time and felt so un professional the final part.