Lazy staff with bad attitude

I had a procedure done in February. A week later I requested for the invoice to claim from gap cover. I was told it's not ready. 3 months later o called again and then was I provided with an invoice. I contacted the medical aid and was informed the service provider needs to resubmit their claim as some codes were incorrect. I contacted yes the service provider on 22 June to relay the message. Then did a few follow up calls. Eventually when donnell resubmitted the claim, she sent it to the incorrect medical aid..... twice. Caled medical aid they stated no claim received... called donnell again. Eventually asked to speak to her team leader who took my email address ans ph no and stated he will intervene. Apparently he has tried to call me but no mail was left, no email received from him. All the communication was initiated by me. I did explain it is time sensitive as I only have 6 months to claim from gap cover. In my opinion due to their incompetence they should sort out the bill with the doctor as it literally seems as if I am begging to pay them but they are refusing to do what needs to be done to get paid. I don't see why I should be held across if the gap cover reject the claim due to the absolutely incompetence and poor attitude from your staff. This is literally their job... what else are they so preoccupied doing that they can not do their job??