unnesesary Dr charges

i was hospitalized at olivedale hospital in 2017 May. before i was referred i asked for a hospital that will not charge me a Co payment as i knew that i cannot afford to pay any. i was then told that because i was on momentum then that i will be taken to Olivedale as it uses the doctors in the Network, therefore i will not need to pay any extra. Olive-dale is not my hospital but i then went there. later on I got a Bill of about R2k for a Doctor who apparently did my Antithesis. My frustration was i went to Olivedale to avoid unnecessary charges post. when i inquired i was told that the doctor was the one available at the time. but I was concious when i got to hospital but i was never given an option and no one warned me that the Dr that was available at the time charges more. fast forward today. this dr has taken me to her lawyer and i am unable to pay this unnecessary debt which was incurred without me choosing to. Honestly was i not atleast supposed to be asked if i was OK with using this Dr who charges more, i went to Olivedale just to avoid having to pay more because i cannot afford to.