Purchased a 2003 Buick Century on 8/17/2018. While test driving the vehicle the service engine light came on. When back at the store we were told other people there had interest in the car, and it was first come first serve. Therefore, I agreed to buy the car, but only if it was serviced, and the issue causing the service engine light to come on was fixed. I paid for the car, but I left it at the dealership to be fixed. The next day we were told a sensor needed to be replaced, which they said they did, so we picked it up. After driving the vehicle for an hour, the service engine light came on again. I called the dealership, and they said to bring it back the next morning. On 8/09/2018 we took the car back to the service department, and I told Jennifer in service that the engine light was on again, and the car was also accelerating on its own. She said they would fix it. On 8/10/18 picked up the vehicle after the 2nd repair, and we were told the part they replaced the first time was bad, and they replaced it again. We informed them my son would be driving the car back to his home, a 12 hour trip to Indiana, and we wanted to be sure it was fixed properly and safe. They assured us it was. However, during my son's trip back home the car started accelerating on its own again, and the engine was revving up high. Out of characters; bottom line is they quit dealing with me and wouldn't pay the $1,300 it cost for the repair. Dishonest and deceptive business practices by employees.