Hey mate, i got my issue fixed and now there is no metal or tak tak sound. You might wonder how did I found the root cause? My office car had exactly same noise so I randomly asked driver of what you think of this noise? He said, sir iskay chimton k nuts dheelay hain? Next day I got the nuts tight of both control arms and thats it, not even a single sound now no matter how much deep are khadday. The mechanic also confirmed that even if single choori of these chimtay nuts is lose, they make very bad noise.
So I was getting this from the day 1 since i bought Swift. It means the root cause is poor assembly of Swift by PakSuzuki techs who do not give a **** but to achieve their daily target.
Hope it'll help you out.