Now that zoya unlikely to find abbu during the intervening period as its only a week and things are moving fast (if CV decide to drag this longer, they can have circuitous route where ZOYA starts from the point she left fathers investigation, parallelly doing investigation of Tanveer but for that pregnancy of tanveer yet to be come out in open. May be we might have few scenes pending.), can the revelation of tanveer happen in any of the following way :
1. Tanveer call up Razia to boast that she is marrying Asad and say all kind of shit that she is married to respectable and wealthy family. This lead to angry Razia (who is also irritated by her problems at the badi bi thing ) to forward the video / photographs of SR to Asad or Dilshad or somebody who can show it to ASAD.
2. Rashid , Ayaan etc going for Nikah with Tanveer and Razia coming to know this. She realizes the implication of this marriage on her and forward the video / photo to Asad / Dilshad or somebody.
I am sure like all other revealation, this is also going to be thru video/ photos as Razia has video/ photos of everything she does.