2005 LEXUS ES Exterior Lightingbrake Lights Problems

I OWN A 2005 LEXUS RX 330 WITH APPROXIMATELY 27,000 MILES ON IT.--MY RIGHT REAR BREAK LIGHT DOES NOT WORK CONSISTENTLY. LINDSAY LEXUS, ALEXANDRIA, VA, WAS TOLD OF THE PROBLEM, CHECKED IT OUT AND SAID THERE WAS NOTHING WRONG WITH IT. SUBSEQUENTLY, I HAVE BEEN PULLED OVER BY A POLICE OFFICER AT NIGHT, AS WELL AS BEING TOLD BY FOLKS WHO FOLLOWED ME AT NIGHT, THAT THE LIGHT WAS NOT OPERATIONAL. I AGAIN, TOLD LINDSAY LEXUS WHAT WAS OCCURRING AND WAS TOLD THAT UNLESS IT DID NOT WORK WHEN I BROUGHT IT IN, THERE WAS NOTHING THEY COULD DO. HOWEVER, THEY OFFERED THAT I COULD PURCHASE A NEW BULB FOR $300.00. ADDITIONALLY, THEY SAID IF IT WAS NOT WORKING WHEN I BROUGHT IT IN THAT I WOULD NOT HAVE TO PAY. I CONTACTED THE LEXUS HEADQUARTERS IN CA, AND THEY OFFERED NO SOLUTION AS WELL. I WOULD SPECULATE THAT I...