Credit Karma IT Support Engineer interview questions

First got the offer on LinkedIn from NxtGen Search Then, I had a short interview call with the recruiter from NxtGen Once they were satisfied, I was scheduled for another interview over the phone with the Credit Karma rep. Even they were satisfied from my interview that they schedule a final onsite interview for good 3-4 hrs! Once I had my interview and it went good, I was told that I will get to hear back from the recruiter and they never contacted me again to at least tell me whether it was good or not or whether they want to move on with me!!! It was very unprofessional of them and the recruiter never responded my concerns again after calling, texting and emailing him several times. They literally wasted hours of my precious time and I had to take a whole one day PTO from my current job to attend the rubbish interview