Claims taking long to process with no valid reason

My son went in for his circumcision on the 27, I called and asked for an authorization code I was told I don’t need one. The procedure was done I had paid cash and then submitted a ln invoice. I’ve followed up a number of time on the invoice that was sent to claims adjustment and I’m still not given a correct response. I don’t know what seems to be the problem one consultant tells me they need the diagnosis code the other wants the procedure code the other wants everything on one line I don’t know anymore what kind of invoice I need to submit for this claim to be processed. Not at all happy with this service I’m getting