Wrong indication of Pre-Authorization

Last week My GP contact me to gain more info on my condition to submit to the pre-authorization department. I have the Discovery Health ap on my phone which showed the pre-authorization code for my procedure to take place on 02/02/2016. I was informed the Afternoon of the 01/02/2016 that my medical aid had not authorized my operation because they have not received the information from my GP. I phoned Discover who had in fact received it via fax. I asked why I have an authorization number and why I was not informed earlier of the clerical error. The call centre said that they will submit my information to the authorization department but there is a 17 hour turn over time. The call centre assistant advised me that I should reschedule my operation. This advise comes from someone that is not aware of the pain I am in daily as well as the four day restrictive diet I have been on in order to prepare for my operation. The call centre has escalated my application which does not help, I had to make a decision as to cancel operation due to no authorization. There is no way I can wait another two weeks. I will resort to paying for the operation and claiming it back. This is unacceptable.