Brakes Failed problems of the 2008 Lexus LS

My 2008 Lexus Ls600hl has a defective brake actuator. Lexus is aware of the issue on these cars and put out a warranty enhancement on the actuator but only for certain Ls that fall within a certain VIN# range. My vehicle VIN did not make it into the warranty enhancement but is experiencing the issues stated in the enhancement letter down to the t. All started yesterday when I almost totaled out because the brakes completely failed when I was driving on the highway at 50mph. Lights came on the dash and I could not stop the vehicle. I was able to run onto the shoulder of the road while downshifting the car to slow it down eventually getting it to a stop with minimal damage to my car. Found out later after getting it towed it needs a brake actuator. I am under the 150,000 warranty enhancement (I am at 125,000) mark but my VIN is not on the repair enhancement list so I cant get it repaired under the warranty. This should of affected by years not by VIN specification. I need this fix and Lexus wants $4000 for something that should be covered under warranty enhancement.