Medicare Insurance Group

I bought Blue Cross and Blue Shield Medicare Advantage, because I no longer will be using my wife insurance, so I picked up BLUE CROSS AND BLUE SHIELD ADVANTAGE to pay the 20% as Medicare will pay 80%. BCBS Advantage is a HMO, and I have to get thing on a referral and doctor under there network, but for two years they denied my test I used to get only twice a year, they wouldn't help me find the places under their network to get a open mri which would create a bill. I said to myself that BCBS Advantage got paid for two years from my Medicare but didn't have to pay 20% on my medical bills because they didn't help or allow me to create a bill nor have they paid my primary doctor for the test I get once or twice a year before I got this BCBS Advantage scam