Discovery useless to take care of their clients

I phoned on 2 November to obtain hospital admission authorization. Everything was approved, I received the code via sms (***2), was told hospital and dr are contracted in, and everything approved. The dr last night said 2 codes need to be added to the authorisation, and ICD10 code and procedure code. When I phoned this morning to add these, there was a problem with my authorisation. What changed in less than 24 hours???? Can this be sorted out immediately as this is urgent, admission date is Monday 8 November.