Refusing to pay for my claim

I sent a complaint about bonitas refusing to pay my claim, and was told would get a call back and I am still waiting for the call:I went to the doctor and he sent me for a CT Scan on 9 January 2019 at Krugersdorp private hospital and when the doctors receptionist called the medical aid (Boncap) for authorisation they advised that they can only pay a certain portion, so I did not go to the hospital for a CT Scan I went to another xrays place that was a bit cheaper with their CT Scans, and I payed cash for the CT Scan because this xray place did not take medical aids they only accepted cash, I then put in a claim for the CT scan to the medical aid and was told it got rejected because as no authorisation was obtained for service date 29/01/2019. But we had asked for authorisation on 9 Jan and they said they would not pay in full, and when I went to the other xray place they said that they only do cash so how could I ask for authorisation if I was to pay cash, Boncap is a **** plan and I regret changing to this plan because now they refuse to pay my claim even though authorisation was asked