Noises During Shifting problems of the 2011 Hyundai Elantra

My Hyundai makes a clunking noise from the front end. It happens whenever I shift from park to drive/reverse, drive to reverse, and vice versa, and also if I speed up, or slow down quickly. I tried getting the vehicle checked out at a dealer, and I was told "I don't know why, but many of the Elantra's come from factory making that noise, and we don't know why. Obviously, if it was a safety issue, then Hyundai would have issued a recall by now. " I was upset by this statement, because it does cause my vehicle to jerk when I am accelerating and breaking, as well as other strange things, so I am concerned that there is a safety issue here. I did buy this vehicle pre-owned, and it has been happening since the day I bought it. I brought the vehicle back to try to get it repaired under warranty, but I was told that there wasn't anything that could be done to fix the issue. I feel really uncomfortable driving my own vehicle when there is something wrong with it, and according to the dealer, there is nothing I can do to resolve this issue.