Mitsubishi 3S dealership is under dewan motors . I found this website : DMMC | Dealers
according to it :
Lahore : Mitsubishi Momentum Motors , 23-A , Queens Road Lahore , 042 36300615
Similarly there are in Karachi, Rawalpindi , Islamabad
Plz note I am not a mitsubishi user i was researching it as Mitsubishi Mirage is looking good to me. Do tell what info you get from the 3S dealers .