Poor service ito claims from Discovery

Submitted claim on 26 November 2018. Details of attending Dr clearly indicated on original invoice. After waiting for 5 days, logged in to see why the claim was taking long to process, only to find out it was rejected because the Dr had an invalid practoce number. I have been back and forth with the claims department because they cannot read an invoice and want to throw around terminology as if I am an ******** client. I have ticked all the boxes and followed due process and it would be highly appreciated if Discovery could do the same. Lack of care for your long standing, loyal customers. Disgusting