Netcare Diagnostics payment demand

My wife went to Netcare Millpark Hospital on 5 July 2024 i received a bill on Saturday 02 November 2024 five months later, the medical aid refuse to pay or only pay a portion of the amount. A week later the account is handed over to a recovery agent who phone me daily demanding money. I made arrangements to pay but this morning i received another call. This is very unprofessional as when i asked why do i receive the statement only know they say they had a back log. Now their problem becomes mine as it is scary. I don't even know the doctor (Dr Esihle Nomlono) of Netcare Diagnostics but its alleged that this doctor saw my wife. Its not that we don't want to pay have some customer service and as it took you 5 months explain why did it took you so long now you just want payment. Poor customer service