CANNOT PROCESS MODIFIERS CORRECTLY FOR IN HOSPITAL EVENTS

My son went in for operation 20 march 2018 and the Orthopedic submitted his account , It is PMB and they still processed the claim wrong , I am waiting on the account to be processed as they omitted modifier and i previously had the same compliant with my PR16 dos 25 10 2018 they assured me that the it will not happen again , that measurements have been put in place so that all modifiers are processed correctly , again TEAM LEADERS say they will be in contact but they just ignore your mails and refuse to see the urgency in this? The kingsbury hospital account dated 25 10 2017 was queried by myself numerously as they processed it wrong irrespective if the 30% c o payment they eventually reprocess it ad turn around and say it is STALE , Really i am running out of patience and medscheme incompetency, send debt letters when their call centre tells you 3 times in differant calls what amount you must pay? is this really how TCF works , I am going to cancel my membership due to lack of competent staff. The person who just puts up a standard company response is wasting my time, I need answers.