Payments not sent through to medical aid

I am very upset about Lancet's service. I had blood tests done in March 2024. Gave them my medical number and everything. As I understood they would have sent the invoice to my medical aid, but in June I got an invoice saying it is not payed. But they never sent it to my medical aid. With follow ups and sending it to the medical aid myself, I realized that it still hadn't been payed. Now they have handed me over to lawyers which I didn't even knew they are going to hand me over. No other communication from their side saying what the plans are forward. Again problems come up because the ICD10 code they gave was wrong. Between them and the medical aid, not one of them want to talk first to the other one to sort this thing out. I am not going to pay. They have messed up and now they want me to take everything on myself. Why do we give medical aid details if they are not sending it through for payment? Or communicating with the patient?