I prefer Mandviwala queens road behind state bank building I.i chundrigarh road - for IG motors do not know much if you have good salam dua with them, yes hand over the car to them.
Here in Karachi agents settle it with the workshop and 3s dealers, the story does not comes to the customers. But some workshops try to make more money from both the ends and story leaks.
@zaka123 : Thats the final answer, follow as @abid110 suggests or if possible get his help.