"Cancelled operation 3rd time"

Quick recap. First operation knee replacement cancelled after spending full day I hospital bed, that was in October. Second operation cancelled in December day before operation. Third operation cancelled end of February by a letter I received 2 days before operation that was actually dated 10 days before operation. They still led me to believe the operation would take place at the pre op on the 19th Feb Nd on the 20th Feb the consultants secretary told me the operation was still taking place on the 24th. Even though she would have known about the cancellation letter, I had not yet received. Been on the waiting list over 1 .5 years. Because it's taken so long my hip has now had it and will need replacing. Shocking NHS service. Just waste money time after time. Quick example. 7 pre oops for the same operation. Hundreds of letters. No other industry could be run like this and survive.