Payment delay tactics

Good morning please can you get someone to sort out my account. Out of R 2500 paid to my son`s neurologist I am getting reimbursed R 400 odd. No referring doctor it says. That is nonsense his neurologist Dr Anderson immigrated last year and Dr Gora was on his list of recommendations. These are just delay payment tactics as per the norm. I paid the Doctor out of my pocket and need this sorted out ASAP.