Lack of Service from Accounts!

I would like to complain about the lack of service I have received from the Netcare Unitas accounts department.

We went to the Emergency Room on 23 December 2018, due to the time of year my medical aid was exhausted. We waited for months for the bill and eventually got an SMS in March to contact Patricia Pillay. I tried calling her 3 times and was never even able to leave a voicemail as her box was always full.

She then finally called me on 28 August and said that I had an outstanding amount, I requested that she email the invoice to me together with the banking details as I have been waiting to make payment all year. She emailed me an invoice that had 2 amounts on it. As I was unclear what amount to pay I rep**** to her, asking what amount to pay, as well as if the amount that I paid in on the day was taken into account as I did not see it reflect on the invoice. After I followed up a second time she then finally sent me the invoice showing the amount to pay on the 10th September, however did not answer me regarding the amount I paid on the day. 2 days later on the 12/09 I got a final demand letter and still no answer as to why the amount I paid on the day has not been accounted for or how to approach this! She has given me 2 days to pay! I have also tried calling her numerous times but there is never an answer!

Please can a manager urgently assist me in getting this resolved as I feel it is unfair and prejudiced to hand me over after only 2 days of issuing the actual invoice!