poor service

i have had surgery done in may 2021. my claim was rej by the m/a due to expired codes. My dr rooms called the medical aid and was given other codes by a consultant that was still incorrect, i have spoken to so many diff people at bonitas and got a diff story each time. the last thing was that the claim was not billed in the correct sequence. im totally disgusted with the poor patheic service from bonitas, i again tried earlier this year to get some assistane but still nothing.