Saved game corrupted on computer exchange. (BORDERLANDS 3)

09/12 - I created my first character (Zane).
09/13 - I went to a friend’s house to play on his PC and I couldn’t find my save game. I created a new character (Amara).
09/14 - I went to play at home and there was no longer my save game.

Who could help me with my lost save.