Meta Image Processing Engineer interview questions

I was contacted by a Facebook recruiter. The technical coderpad phone interview was scheduled quickly. The interviewer didn't even introduced himself or asked me anything. He jumped right to coderpad. He couldn't understand my questions during the interview and we didn't have any clear communication. I was asking questions to clarify the coding challenge as I was coding with no answers. Very poor communication. At the end of the interview again no greeting no mention of what to expect. He just said bye and left