Network specialist terminated in the middle of the month with correspondance with member

My GP referred me to a specialist,i logged on to the Bonitas app and scheduled an appointment with a bonitas network specialist. I went to see the specialist in the beginning of July,went for follow ups in July and my operation was scheduled for the end of July. I recieved authorisation from the medical aid with a co payment for my procedure,which i paid. After my surgery i was contacted by the specialist regarding a 17000.00 oustanding balance from my procedure. I investigated the matter only to find out in the middle of July my specialist was terminated as a network specialist and that i am now liable for these costs. I have sent multiple emails begging them to provide me with the email or correspondance they sent me to inform me of this,but there was none. Their so called sms was never successfully sent. I have had to cancel my medical aid to afford to pay this specialist. No one at bonitas has taken accountability for this,someone did not do their job and now i have to pay 17K.

Please be very carefull!