Rocket Telecom Engineer interview questions

Was approached by a headhunter and agreed to an interview with the Telecom team. On the phone with 5 other people. Interview lasted 30 minutes. After 25 minutes of answering questions I found out I was interviewing for a different job than what I was told and prepared for. 5 hours after interview I got a call to my personal cell phone and challenged to find a solution to a problem. I emailed my solution and was told "That is technically the way to do it, but not how we do it here." Was then told the next day I didn't get the job. People on the phone seemed snobby and talked down to me. Wouldn't want to get a job there at this point. The whole thing left a bad taste in my mouth.