Ye you should get it back if you got proof like cd-keys.. But maybe you bought it digital? But then you should still have a reciept of it somewhere that is proof enough..
But else with new Loot 2.0 and Paragon 2.0 it is going to be much better to play.. Really much easier to find good item you can use and so on..
I got Diablo 3 for Xbox360, where it is like Loot and Paragon 1.5... Like I get at least 1 legendary each hour, that is setting it low, and now legendary is usefull, not like in start of Diablo 3 where they where just crap.. Also things have a smart rolling system where it roles more with your main stats, so on DH you get DEX and Wizard you get INT... It is so much more fun to play right now Xbox than playing it on PC..

And Paragon Lvl is shared over your account..