Authorisation done , And now no payment ?

On 28 October 2015 i received Authorisation from Fedhealth for a Procedure that needed to be done to my two year olds teeth , with the authorisation i gave in all the codes as received from the dentist . They gave through the authorisation , and told me that there is only a small amount they are going to pay , but i needed to contact customer care to find out how much they will be paying out , i spoke to a customer care agent called Darren on the 3/11/15 and he explained to me which codes they would be paying what amounts on , which it wasnt much and i wasnt overly happy with the outcome , but saw the glass as half full and was just happy that they were going to pay something . The procedure was done on the 5/11/2015 and then afterwords fedhealth sends me a email that they wont be paying anything , when i phoned the customer care centre , the person i spoke to told me that different codes were used than what was authorised . I tried to speak to a superior , and was holding on for 10 minutes before i eventually put the phone down , when phoning again to try and resolve the matter , the lady i spoke to now tells me is not being paid because my benifits are depleted and wrong codes