"Patronising behaviour"

I have been on a waiting list for a septoplastic since last summer. I was called for an operation on the 6th January but because I have been flying, for the past 2 weeks (and I am aware that I should not fly 2 weeks before and after the operation) I asked to postpone it. Comes to May I receive a letter x the operation to be held on the 10 of may and the pre-operation for the 17th may. Again I rang twice and tried to speak to the administrator before the date of the operation. I never managed to speak but left 2 messages on the answer machine, asking to be called back. I was never called back so I had to cancel the operation again. I did book the pre-op for June and asked the nurse to put a note on my file, asking if the operation could take place after September (since I have 2 international flights between July and August, both 3 hours long). The day after my visit, a letter was sent saying that i asked to be removed from the waiting list for the operation. This was not true, so I rang the administrator x ent who was rather rude and the bottom line was that I had been 'punished' because I had already cancelled twice the operation. I tried to explain my reasons but I was neither listened or treated with respect. I was told to call back in September to be put on the waiting list. I also explained that I will have to fly in December - January and the same problem would occur. There was no willingness to help and the only point was: you have done this twice already. While I understand that there may be other people waiting for urgent operations, I cannot be punished if I am called 2 weeks before or if I am sent the letter inviting me for the operation before the pre-operation appointment. And above all, I think I should be treated with respect and not taught a lesson. Very disappointing experience