Rude accounts department

On the 27th January I was transported from Newcastle to Pietermaritzburg. Authorization had to be approved by Discovery medical aid. I now get messages to settle outstanding account. Today the 27th of February I phoned ER 24 head office to inquire about account with a Lindiwe who was so rude and abrupt when I inquired about account. She slammed the phone on me. I did not authorize ER 24 to transport me to Pietermaritzburg.