Also, another reason I think Tejo will believe it's Fateh because in the Promo when Tejo is crying for help she doesn't say "Fateh bachao" once, usually in such situations the first name that comes in your mind is the person you love, even in Jas time Fateh was the first name that used to come in her mind, so it's probably because they will trap her in a way where she will believe it's Fateh on the other side.