Level of service absolutely shocking at bonitas medical aid

I'm currently on the bon cap plan with bonitas medical aid, i attended the trauma unit in mt Edgecombe private for ulcers, im receiving final demand letters from the hospital for outstanding bills dated 1st April and 15th july 2020. When contacting bonitas im going back and forth between the hospital and bonitas, as they are playing the blame game. The hospital is stating that the code is correct as its for ulcers (K29. 7) and thats what i got treated for on the 1st April and 15th july 2020. Code (R10. 4) is for a abdiomal pain. They said they can't change the code as K29. 7 is for ulcers and r10. 4 is for abdiomal pain. Furthermore they stated that case management only deals with patients who got admitted at the hospital and stayed over. I was attended by the trauma unit only. So I'm basically paying for a service that I'm not receiving. I'm absolutely shocked with the level of service from bonitas. You can't speak with a human, everything is automated. Mt Edgecombe pvt is now sending me final demand letters for outstanding payments. I'm trying to have is query resolved from April, however uptill date I have been unsuccessful. I don't know what too do anymore.