I too own a Sprinter 110 from last 2 years or less. got it tuned today from F.R Autos akbar road.
anyways: for your sprinter. get it repaired from "Sualeen" denter at akbar road saddar Regal chock karachi.
If you like to spend more you can get a new frame from F.R autos who are the 3s dealers for Suzuki Bikes, plus they can help you with excise paper work for replacing the frame.