Frustrated and disappointed

I took my son to a speech&hearing the****** on the 22nd of September&she said my son needs a hearing aid,since then it's difficult.1st I was told that the hearing aid is rejected because the the****** didnt put the nappi code, I told her then it was approved,now it is rejected again because the tariff&nappi codes are in correct.Last week Friday i went to their offices to find out what's going on&was told about the codes i sent her the message.She send again the codes this morning I receive an email saying the hearing aid is declined again,I then called polmed was told it's the nappi code,so I really dont know what to do because it's long and my son needs the hearing aid because at the end is going to be permanently deaf.