Non payment of legitimate claim

My son was hospitalised last year for a rugby injury. I constantly had to follow up with Bonitas regarding non payment of Practices and hospitals. I am sitting with a claim from a practice that still has not been paid. I have all communication between myself and Bonitas and they claim it is a stale claim even after I have given them evidence that the invoice was submitted within the required time. I have left several messages for Nthabiseng or a team leader from their client support to call me, but non of my calls have been returned.<br> <br> Please could someone address this matter as it is a year old.<br> <br> Regards<br> <br> Zivia Sallie