Epsilon Senior Software Engineer interview questions

I was called for interview in Epsilon,Bangalore through a consultancy on weekday. My first round was Technical and was some medium level questions of Dotnet technology. I waited there for more than 1 hour as they asked me to. Second round was I guess managerial because all he asked was What technology you worked ,explain the architecture,how do you handle certain situations etc. Then he told, our team in US would like to talk to me once and that would be through Skype. After a week, my Skype interview was scheduled and 3 mangers and the one first manager who interviewed me were supposed to present but only 1 was available and he asked all the project details for an hour. Later they told me since other 2 managers did not talk so we will have other call . After a week, interview was scheduled and again 1.5 hours of interview both managers. It’s not all, they told they’ll inform me about the status. Later after follow up with HR ,2 weeks later she called and told me I will have last round with office manager or head of Bangalore office or so. She called me and me about previous company and why am I leaving this company. It’s just that she told okay. After that I did not hear from them. For scheduling interviews I had to follow up with HRs, for status I had to follow up like many times. They would take 1 week after every round to tell the status and schedule next round. The most unprofessional people. It was more than a month I had my first round to last one with no result at all. They didn’t even bother to tell me why I was not selected even after asking HR many times. Pathetic!