Capgemini Engineering Consultant interview questions

Brief interview with hr and with manager. Background check questions aboue previous experience and methodology. Very quick process and response. Good

Call from HR, total 3 rounds of Skype interview starting with technical, HR and finally with team manager. The interviews in itself went very well. I did extremely well for technical and answered 95% of the questions asked ( C and embedded systems). Only the final interview was rescheduled multiple times. The whole process was for over month and a half. After the last interview, I was given a very vague response that my work experience was narrow. That is an extremely vague answer and moreover they had this work experience staring them in their face with my resume, technical interview all through. I don't understand what was the reason to waste my time for such a long duration. I would have appreciated a professional courtesy of informing me then and there and stopping the process. Unprofessional.