Poor Service GEMS PMB Department

Gems not paying my mother's Lancet Lab accts. Dr submitted incorrect ICD. 10 codes. I called GEMS numerous times to resolve situation. Resubmitted account to Pmb Dept. with ammended ICD10 codes - Cardiac Failure 3 or 4 weeks ago. No feedback to date except being told, Escalated to Pmb no feedback last week. Re-escalated today 02/08/21. No accountability. No compliance with turn around times. Seems like there are no Managers in PMB. No accountability. Ongoing follow ups no resolution. One month has lapsed. This is how they treat 81 year old clients. Shocking, disappointing as 8 have never had a problem with GEMS before. I was promised a call back from a Manager at GEMS PMB in the next half hour. Let's wait and see.