I've gone to Munford Tire and Brake for 6 years now, and never once had a problem.
So, first off, your grammer is horrible. Second, a loose hubcap will NOT make you run off the road, nor will it make you wreck. It will come off, but it is mainly there for decorative purposes (to cover the bolts that hold your wheel on), not to hold your car together. Third, Jason was never anything but nice to me. He was a good-natured sales associate and great with every customer that he ever came in contact, whether it be in person or on the phone, while I was physically there.
Your story sounds like a crock of crap, and I agree with Andrew, I think you're just peeved because your step brother isn't with the company anymore. And, if his knowledge of cars was anything remotely close to yours, I can completely understand why he is no longer there.