I bought a Toyota Prado where the Car Play is faulty. I have gone to 5 Toyota Dealerships and none of them are able to fix the problem

I bought a Toyota Prado where the Car Play is faulty. I have gone to 5 Toyota Dealerships and none of them are able to fix the problem. They do not even have a software update. It is an Electronic intermittent issue. The Car also makes a constant electronic buzzing noise. I have called Toyota South Africa to no avail. Terribly disappointed in the service I am receiving & am unsatisfied to say the least. Once the car has been Sold & they get their payment. Toyota is no longer interested.