Kohler Co. Senior IOS Developer interview questions

They don't have any process for hiring app developers. I got call from some consultancy, then HR from Kohler contacted me and schedule a face to face interview, I asked him what is round about, he wasn't clear he told me there will be face face to face discussion. I given first round , Interviewer was quit impressed with the interview, Then I got call from Kohler HR saying that your interview feedback is positive , your next interview will be with U.S. guys . In second interview they asked me about projects worked on and some managerial questions. That was a good discussion, they were also happy with interview. Again after a week, Kohler HR called me and said there is another technical round with Indian guy. (Then I was like what is going on?) I said ok. Again in third interview he asked me 80% question like first round. And he said will let you know the result. Then I was expecting a feedback from Kohler. But even after 10 12 days no reply. Then I wrote a follow up mail, just asking about my feedback. HR didn't replied me! Again after 4 5 days I wrote another follow up mail, again no reply. How disgusting is this? I was very punctual in all interviews at scheduled time, don't I deserve even a reply?? I never thought company like Kohler will do like this.