Lost days worth of saved progress on bl3

I got back online on my steam account to play some bl3. I get on the game and notice I lost 30 levels and days worth of campaign and dlc completion. I have proof I had all of this and more I even got achievements for everything I lost and pics. I am so pissed honestly if I can’t get this fixed I am done with the game. I am not going to play this game knowing this could happen again.

Moved to the pc tech support section, where you may find other folks with a solution to your problem. Good luck.