Visiting rights towards my daughter after 7years

There is a strong possibility that on account of these 4 years of absence, your child may have been brainwashed against you by your ex-wife. Winning her trust back is not going to be a cakewalk for you and you should be prepared to face the music.  While your intentions may have been correct, your actions have severely jeopardised the chances of reliefs which you could have obtained.  All orders relating to children are temporary orders i.e they are subject to modification on account of changed circumstances.  But now even if you go to the Court, your wife will appear and point out your absence of 4 years and claim that you came back only to harass her.  So the only route left to you is to approach your wife and hope that she lets you avail access amicably.  

Trace your wife, and send legal notice to allow you to visit the child. In the notice, clearly describe why you did not meet child. If she ignores the notice or doesn't allow, warn her that you'll move child custody (GWA) and even Habeas Corpus. Those threats might work. If they don't, do move a GW petition. Your wife must fight it, even though you separated with MCD, otherwise you'll get exparte custody order. 

1) file for specific withdrawal of consent terms in terms of visitation & custody clauses that were signed earlier.

2)file petition for child custody under guardians & wards act along with interim access application.

3) also file Injunction application for stay so that your ex-wife does not relocate or give the child for adoption

4) if the moter & child are untraceable... then file a police complain... wait for 15-20 days for them to act... then you can also file a habeus corpeus petition at high court.. once they are located .. serve them copy of custody & injuction for stay application.