You've definitely got problems back there, and if you can't see what it is, you need to get it to a brake shop where they can give you a proper diagnosis.
It really strikes me as odd that you say BOTH rears are not working. That doesn't jive well with your previous problem of one pad wearing out without the other.
Since you say you're all greased up, I'd be recommending you check that your pad have adequate clearance at the "ears". I have read of some members having problems with pads with ears that had to be ground down to get clearance (they should have just returned them); and next I would suggest that if all else is working, you may just have a bad caliper. BUT, when you throw in the "both sides" element, that kind of puts a whole new twist on things.
Brakes are important... if you can't diagnose & fix quickly on your own, you need to get it looked at by a good brake shop.
FYI, the "One pad wearing" and "Both rear sides don't work" issues sound to me like two completely independent problems.
Good Luck.