Provar Javascript Developer interview questions

I have got the call from the HR for the interview for the post of JavaScript developer and I have such a worst experience in the interview . initially that HR was expecting that that I should not look for any other offers if I got it from powar testing. So they conducted my first round for the Coding online test and I got two coding questions which I had been passed and HR call me to conduct the second round of the interview and after scheduling the second round of the interview they cancel the interview and did not even communicate what is the reason behind the canceling of the interview when I called the a chart on the interview date they told me that the interview has been cancelled and the position has been filled so I felt like waste of time in giving the interview in this organization such the poor unprofessional behavior they have showed.