Spreadex NET Developer interview questions

Got this job interview though a recruitment firm, there was a codility test at first, then a phone conversation and after those the face-to-face interview. They interviewers made me feel unwelcome, as soon as I got to the office we talked like 5 minutes then they handed me a paper with an algorithmic problem, then a C# test in which I needed to identify problems.. One of the interviewers said almost no word and just wrote things down and staring, the other one tried to make a little conversation. All in one that was the worst interview I ever had and did not got any feedback. Although it's my fault I've lost my confidence and didn't do so well.. an interview is nerve racking. I think they did a bad job to get to know me and also be friendly.