NEED TO SPEAK WITH SOMEONE OTHER THAN ACCOUNTS

I have no option now, because the lady that works with the accounts cannot understand what I am saying to her. I need to speak with someone else, no one else at the practice can assist me. Now I do not know what to do to get my issue through. It is not difficult. They say we owe money on our account. Our medical aid paid 12 visits - as it reflects on their statement. The doctors statement only reflects 4 payments. Where are the other 8 payments!!!!! If they correct their account to reflect the 8 payments that were paid to them as on the medical aid statement, then we do not owe any money!!!!!! This is extremely frustrating and I refuse to pay when the account is up to date. I cannot get this lady in accounts to understand - WHERE ARE THE OTHER 8 PAYMENTS THAT ESSENTIAL MED PAID YOU??!!!! She keeps saying you need authorization after 12 visits. THAT DOES NOT MATTER!!! WHERE ARE THE OTHER 8 PAYMENTS that they paid you?! WE WERE AT THE DOCTOR 12 TIMES!!! THE MEDICAL AID PAID 12 TIMES!!!!!! You did not do your bookkeeping correctly!!!!!!!!!!!!! I am a bookkeeper, give me your pastel and the business bank account, and I will show you how you correctly allocate to my account!!!!!!!!