Poor Service

I purchased a foam walker boot from MKem on 26 July 24 due to a leg injury. I paid cash and requested proof of payment in order to claim back from my Medical aid. I submitted the receipt to my Medical Aid only to be told that I need an invoice. I called MKem orthopedic dept and spoke to Shaun. I requested the invoice. I called a few days later as I had not received it and was told by Shaun that they were sorting out their computers and I shall receive it shortly. I received it on 05 Aug 24. I immediately submitted it to my Medical Aid. M Medical Aid rejected the invoice as it did not have the standard reuired ICD10 code. Toda (22 Aug 24), I sent MKem an email requesting that the resend the invoice withe the ICD10 code. I also submitted the Invoices from Morton & Partners which clearly has the ICD10 codes. Now MKem tells me to get a motivational letter from the doctor. It's standard procedure when submitting an invoice for the Invoice to have the correct codes. MKem should know that as they deal with medical aids on a daily basis. I cannot understand what's so difficult about that. I paid MKem R2000 at no stage did they state that I must get a motivational letter from our doctor. The treating, hospital, Xray companies have all been paid b the Medical Aid but I'm still struggling to get payment due to incompetence.i