What do I do about a toilet flange that is too high?
I found this 2 part video on YouTube that helped me understand what to do.

part1
part2

I ended up cutting off the top of the flange with a PVC pipe cable saw.  I then used a mini hacksaw to cut some segments into the fitting and wedged the pieces out.  After removing 2 small parts of the ring, the rest just wedged right out without much effort.  I cut down the pipe to be flush with the floor using a pull saw.  I put a level down and found the concrete was not level around the pipe.  I used a rub brick and the mini hacksaw, which I could angle to cut the inside of the pipe, to get the pipe and surrounding concrete truly level with the rest of the floor.  This took a while.

When I finally got it level, I put in a Twist N Set Closet Flange.  I drilled 4 pilot holes and put in concrete screws.  The toilet is now level and not going anywhere.  Now I just have to fix my guest bathroom which has the exact same problem.  At least I got a good deal on the house.