Wrong ICD-10 code used

lancet submitted the wrong ICD-10 code for payment by my medical aid. it is now 3 months later and numerous phone calls later and they can't send the claim through correctly, or assist me in a way that the account can be paid. I am reminded every time I am responsible for paying the account even though Lancet made the mistake. An investigation by Lancet provided zero results and no feedback was received. I will have to use another company in future that is hopefully more capable of lodging claims to medical aids.