Nobody seems to connect the letter to Shiv. It should be obvious to the others that Shiv's behind the whole tamasha. Afterall , the letter was addressed to Shiv, with details about how to contact Nitesh. So, why hasn't it struck anyone to doubt shiv? Maya knows that Shiv had dropped the letter 'by mistake' so he would have read it.
If they don't pick up on this clue then the story writers are silly.
Meanwhile, Shiv's plan is surely going to backfire now that Kaya's confessed. So when the chasmish friend comes to investigate he's going to get the shock of his life...bhabiji is not going anywhere!!