No support or feedback

I have had some trouble with my vehicle which is still under warranty, I have had it back twice now for the same problem, each time I receive a call to say that my vehicle is fixed, only to find that the same problem still exists. I then attempted to make a third appointment for the same problem, when I requested to receive a courtesy vehicle (which I find is only fair and I have no other way to get around), I was told that a no vehicles are available and that no arrangement for one can be made. I then contacted Ford head office a week ago, to issue a formal complaint, I received a call a day later from the dealer principal to assure me that my problem will be handled. A week later and still no response from the dealership, or Ford head office, and my vehicle has still not been repaired. I find that the lack of service and aftercare support from the dealership and Ford is totally unacceptable!!!!