Transmission Failure problems of the 2003 Hyundai Accent

My car was driven under 70,000 miles when my transmission started going out. I was in the car with my one year old niece at the time leaving to go home. My car started violently thrusting forward with all of us in the car and was jerking violently. I thought we were going to get in an accident with the child in the car in March 2006. As we pulled on the freeway the car did the same thing for the first 10 miles and we were sure we were going to die. But I pulled off the road and let it cool down. When we arrived at my parents we serviced the vehicle which I think had to be towed and I was given a refurbished transmission in March 2006. During the fall of 2007 the same problem occurred and the gears were acting up as they were before and the car was violently thrusting forward and jerking. I almost got into an accident while going to work with my students. I reported it to Hyundai motor of America and took it in for repairs in September 2007. They installed a refurbished transmission and took care of another powertrain issue and installed a new alternator. However in the fall of 2008 the battery and alternator went out and I had to pay out of pocket to get it fixed although the alternator was still under warranty. After I took my Hyundai to the dealer to get an oil change in the fall of 2010 I noticed that it was acting strange. Needless to say my transmission was acting up again and I almost got into an accident with 3 other cars due to it's violent thrusting and stalling in November 2010, December 2010, January 2011 and February 2011. In April 2011 it was diagnosed that yet again I had transmission failure. I contacted Hyundai since my transmission fails every 10,000 to 70,000 miles and the transmission goes out every 1-4years with my car so it is consistent.