Has anyone else had the problem of not getting authorized for cancer treatment?

My fiance has stage 4 colon cancer with liver and lung mestasis. He was dx in 2015 went thru chemo and stopped after 13 rounds.. Well to fast forward a bit the cancer was shrinking and after second bout of chemo he was put on a maintenance drug.. We had a ct scan 11/23 everything was fine he was told and so we were gonna stop the maintenance drug next appt. But he got sick @12/10... We thought it was a bug plus he felt constipated... So we waited and I noticed his stomach had swollen so we immediately went to the e.R. That's when my whole life was changed... They said he would welll die... So we accept that... But then we felt why not fight.. But no-one will help us... He don't want hospice.... We just want to get to the moffitt cancer center where a similar case was successful . The one insurance dropped his cancer dr. So we got new ins. When enrollment came... Since first one dropped dr.S after enrollment was up. We went through 2016 with no ins. Help(denials). Then we looked on moffitt site to see what ins. They accept and I chose humana gold plus.... Now we're seeing a silver lining right ... Wrong !!!!! Now we are here 2/19/2017 he is still here and all we want is a auth, to get to moffitt. So his new pcp says no! He don't like moffitt so I call humana to report him and they stand behind pcp... So I change pcp's problem solved right..... Wrong now new pcp says not in network so I call moffitt on speaker phone with pcp 2 and they tell him.... All you need is to auth. We have him registered with moffitt. But they won't give auth. Please help this dying vet..... Please can someone anyone help.