Disappointing medical aid

I am on Discovery classic comprehensive plan. My son (22 months ) amputated his finger on 12 of Feb when we where on holdiday.We took him to the nearest hospital Nectcare Umhlanga. They have done an emergency procedures to save his finger after Discovery approved it. Only now I have to get some unexpected bills because discovery isn't covery the cost beacaus the doctor wasn't registered as n Discovery doctor. We were in a shock as parents and thought that our medical would cover the cost off an emergency because we are on a good plan. But next time when we are in an emergency I have to worry about cost. I will definitely leave discovery at the end of this year . After R9000 per month and I still need to worry about emergencies then I don't think this is a good medical aid. I am still waiting for the discovery employee to call me back as he promised. This is the worst medical aid and service it the world.Discovery said that emergency procedures under 24 hours they will cover the costs . They don't keep there promises just like there staff that promised that he will come back to me.