NeoSOFT .NET Developer interview questions

I have given 1st round of telephonic interview and got selected,it consist of all the questions from .net,sql,c# and oops concept. After qualyfing i got call for attending another round which is skype video call,after arranging 3-4times and cancelling they finally arrange the intrview after 15days.the intrview goes well and i have answered all.the que. The interviewer seems to be rude and quite in a hurry as she doesn't want to hear what I am saying and throwback another que. Still. i say all correct answer. After calling Hr for feedback, they told me the feedback is -ve, I didn't understand where it goes wrong and I asked HR about the same but didn't get any response back. They wasted all my time as they arranged my second round on Sunday and I have given it too but still, they don't want to give job I think.

First rounds is machine test after that conduct technical interview asked some basic questions on net technology.total wasatage of time anyone can conduct interviews they don't give interview feedback also.