PMB struggle!

For what you pay you'd expect first class treatment from Discovery but good luck if you have to claim PMB benefits. Case in point, my son has a diagnosed condition that has been previously approved for benefits. Now , after applying for the new year they've rejected some valid codes, and of the approved codes, they limit some sessions only up until December last year? So do I need to go back in time? Other codes were approved for a whopping month. So do I have to wait until April before I apply yet again in the hopes they get it right? In the meantime my son has to miss valuable treatment.