When I was in my early 20's, I bought a brand new Pontiac Sunbird, from the local dealership. About a month later, I was driving down the road, and the lights began flashing off, and on. I took it home, of course, and parked it. A bit later, I went out, started it up, and checked it. The lights seemed fine. I went to the little store down the road. Everything was fine, until I started back to the house. Again, the lights flashed off, and on. When the lights would warm up, after about 3 minutes, they would flash.
I took the car into the local dealership, and told the guy in the booth, with the clipboard, outside the mechanic section, about what was going on. Ok, they would fix it. 2 days later, it was ready, so after work, my brother took me to get it. I started home, turned the lights on, and lo, and behold, they started blinking. I called my brother on his cell, and told him to turn around, and meet me back at the dealership. I didn't turn the lights off.
When we got back to the dealership, I started talking to the guy with the clipboard, and explained they had not fixed the problem. He had me turn the car off, while he was writing. When he got done, he had me start the car, and turn on the lights. "See, they're fine". I told him to wait just 1 minute, and they would start blinking. Sure enough, in just a minute, they began blinking. He accused me of turning the lights off, and on, and made me get out of the car. By then, my brother had arrived, and walked up next to me, listening to clipboard guy.
Very calmly, he asked clipboard guy "what the hell are you smoking?" You think my sister has nothing better to do, than come here near closing time with her car, and blink the lights, just to play with your mind? She's been inconvenienced by not having a car for 2 days. You guys said it was fixed. It's not. Fix the damned lights, and stop the crap. The look on clipboard guy's face was a kodak moment. You have no idea the fortitude it took, to prevent myself from busting out laughing right then, and there. We calmly walked back to my brother's car, got in, and busted out in laughing.
The next day, I was assured it had been fixed. I tested it on the way home. It was really fixed.
Take your car right back to the dealership, and run it through again.