NuWare SQL Server Database Administrator interview questions

The interview has been scheduled by HR and even the interviewer has been joined the call and he said he has some issue with the voice and asked me to put the microphone but i wasn't having the microphone so told the same thing to him, he suddenly said just a minute and he left the call and didn't join the call where i was waiting for 15min for him to join, tried calling to HR even HR dint respond for my call/msg. Please let the candidate know issue before ending up the interview, if your not interested to take up the interview pls don't schedule the interview itself