Health4me not clearing billing issues

Since February I am trying to sort a Ampath bill with Health4me that was supposed to be paid in full but there is an issue with billing codes. Health4me said that everything is settled but Ampath still send me the bill. I have tried to solve this issue via email but without luck. This is exactly the same blood tests that was covered last year but now there is issues. I my account gets handed over I will take legal action.