Vistara — not getting details of boarding pass and terminal details

I m extremely disappointed by the services of vistara airlines. I’m flying from new delhi to hyderabad on 4th june unfortunately terminal is not mentioned in my e ticket and i have written the mail regarding the same which i haven’t got a reply. Yesterday also i’ve checked in online and the boarding pass is not sent to my mail. Ihave no idea about my flight which is really disappointing.