After being approved my insurance changed mind

In March 2003, my doctory submitted papers for approval for WLS. On March 31, 2003, my insurance, BCBS of MN, approved the WLS due to medical necessity of health problems. On May 16, 2003, I had an open RYN, stayed in hospital until May 19. About a week later I had an infection (which I am still fighting) to set up in my wound. Yesterday, June 09, I received my EOB for the procedure of WLS (before I went into the hospital I received pre-admission authorization for WLS) and all the cost. Well my insurance said they did not approve this procedure and they would not pay for it, but I have all the letters of approval and pre-authorization for the procedure. Do they have the right to refuse to pay for my sugery. Any help and suggestions as to what I should do will be greatly appreciated.

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