Poor service

I just purchased a car for my wife. I was ensuring that the car is in perfect running condition before giving it to her. The only issue that I had was a vibration at highway speeds. With my extensive knowledge of cars I suspected the balancing of the rear tyres. I took the car to bluff tyres as other fitment centres were too busy. I had all tyres balanced. Drove off assuming that my problem was over. The problem was exactly the same and at the exact same speeds. Now I was really concerned as I now believe that there's a serious mechanical problem. Being extremely concerned, I called the dealer that I had bought the car from to relay my dissatisfaction and disappointment. He asked me to take the car to Hi-Q in Richards Bay to redo the balancing. This I felt was irrational as I believe was unnecessary and time consuming. I never the less took the car to Hi Q. I stood at the balancing machine while the balancing was being done. I was shocked and flabbergasted at the results. It seems as though it was never done in the first place. After the job was done I took the car for a test drive and it was perfectly fine. I went to bluff tyres n explained my situation and asked for a refund. I was told that the manager could not be reached. I left my details and was told to come back for a refund. My point is that the money isn't the issue. We believe in these people and fortunately I am mechanically minded. How many people accept there inferior service and take it for granted. I'm yet to be contacted.