"Appointments constantly being cancelled"

The Royal Free Hospital has cancelled my sons Paediatric Dermatology appointment 3 times since he was referred from our GP. The service is disgraceful as my son has been having his appointments cancelled since last year and then to top it off, I received a letter today to tell me his appointment was cancelled again, but within that letter there was no compassion or anything to suggest that they even sorry for cancelling the appointment, it was a case of them just printing out the appointment letter and crossing it out and writing 'Cancelled' - This is by far the worst experience I have ever had with the NHS and the Royal Free! I can totally see why people prefer to go private. As a UK tax payer, I received a letter in the post telling me about my taxes and where they were spent and the second one was health, yet it seems like trying to get an appointment which isn't cancelled is like trying to get blood from a stone.