Need to terminate SNF. Anyone have experience with this?

I went for rehab at a SNF which was St Peter health partner or affiliate after heart issue (afib) and after 2 weeks on Medicare was told no longer improving, hospice eligible and 6 months to live. So thrown off Medicare and had to private pay. I was placed on oxygen at 4L, but couldn't stand water dripping. Long story short after replacing defective concentrator I asked for PT and Medicare to resume and denied by Medicare, but told I could pay for it. I rehabilitated myself and got out after nearly 4 months. Been living in assisted living past 5 months without oxygen so someone messed up as I ain't dead yet. Think there may be grounds for financial abuse of elderly, misdiagnosis, etc. Anyone have experience getting CMS to do right thing and terminate providers who are abusing patients?