8 month outstanding account

My son has seen Dr Theunis Botha on 19 October 2017. To date this has not been paid. I have numerous conversations with the supervisors and been promised that this will be paid when the next payment run is done. Now 6 (six) months later and still no payment has been done. I am now getting a bad name due to Affinity. The sentence I also keep on getting is that Affinity has overpaid Dr Both and that they are waiting for Dr Botha to pay Affinity back, before they will pay this 8 (eight) month outstanding account. I do not see how that has anything to do with my account. Again today I am being told the same story. I also keep on holding on for hours before anyone come back to you or that they will phone you back and that never happens. I have now reached a point where I need outside help to sort out this account. I need this account to be paid up to date with the interest for the last 8 months.