There is nothing on their terms about a video call. I sent them copies of my drivers licence and a utility bill for my proof of address .. i responded to "Julia" that next time will ask for a naked photo with me for verification .
Well as someone already mentioned they are not going to release your btc without the video call, so just do that, get your coins and never trade with them again. Good thing you opened up this thread, so others can stay away from them.
Keep us posted how it went.