Thanks sunsweet for your response. My lawyer had already sent two emails to NDVO about this issue. Good to know in worst case, I can use a copy of my ecas printout and get the gatekeeper to let me in. As for interpreters, I saw someone's copy of interview letter. There it is mentioned that a list of authorized interpreters attached for people who need interpreters other than hindi or punjabi. Unfortunately, they sent him interview letter without attachment. If someone who is reading this post had used interpreters other than hindi or punjabi for their interview can respond to my post or send me particulars about the authorized company, I really appreciate it. Hopefully those NDVO jerks would respond within a week or two and send a copy of official notification.