Insufficient staff members

I phoned on Friday 17/03/2023 to get auth for a procedure do be done on the 22/03. The person I spoke to was helpful and efficient. She went through all the terms and conditions with me and provided me with an auth nr. On the 22nd I phoned the helpdesk to obtain a auth letter, however the lady that assisted me decided that the procedure that I was about to have is not good enough for the hospital and retracted the auth. The Dr sent motivation through but yet not good enough. I am not furious that they don't want to give the auth I am livid that I had an auth for the procedure and while sitting in my teatre gown I am advise that the procedure won't happen. Discovery is wasting my time, my money and my patience.