Not paying as stated on plan

Went to ER in July due to me having so much pain. ER stated that I need to have a CT scan done. I repeatedly asked what the cost would be and was told that I only need to pay the co-payment and nothing else. The medical aid will cover the rest. Even my plan stated co-payment only. Months later I receive an invoice to pay the balance of more than R10 000 as Bonitas is not paying. After so many emails sent to Bonitas I just get the same copied and pasted response that Im liable to pay. No one actually reads your email. I asked the lady at hospital are you sure I only need to pay the co-payment, she said yes nothing else. That I could afford and had the scan done. If I was informed otherwise then I would not have done the scan. According to Bonitas it was not an emergency. Seriously? I was in so much pain for me it was an emergency as no Dr knew what the cause of the pain was. Why do I pay installments when you hardly pay for anything. Your service suck. Your plans suck. If you are not willing to pay for the scan then dont bother phoninh me to "resolve" the complaint. The radiologist wants to hand me over because you dont want to pay for the scan. I joined Bonitas because your rates are cheaper than most medical aids but I guess with cheap rates comes cheap service.