Terrible service

My Medical Aid gave me a Authorisation number to go and see Dr Hassim at ConfiDental Studios, however when I presented the number that was given, the receptionist refused to accept it, because I was on the Custom plan (Momentum) therefor I had to pay cash. I was fuming as now I had to pay for the whole process, unfortunately I could not just leave as I was in agony and needed my tooth pulled. Now it 5months later and the Medical Aid is refusing to refund me. So I phoned the dentist asking for my ICD10 code. That's what the Medical Aid wants, They are refusing to give it to me. Just because I paid cash????? Don't know what they are up to. But I can't claim on anything without the code