Pathetic service failure to follow procedure.

My son had surgery in November at linmed hospital. Everything was authorised, I get a invoice for 1st week of January that I must pay +-R7800 for the time we were there which was authorised and when I called now which is impossible to get hold of anyone and Mabel mogemi is the most unfriendly unhelpful person ever with such attitude like shes doing you a favour even speaking to you. She claimed medical aid rejected the invoice which is not true as linmed didn't even bother to submit the invoice to the medical aid for payment. She didn't even have the authorisation code that was approved. if it was submitted to the medical aid properly it would have been paid over a month ago. I will not pay this account because of linmed inability to follow the correct process. I emailed her telling her to do her job and submit correctly to the medical aid disgusting service.