My world completely ruined

Hi,

I saved my game "Primer Mundo" and when I returned I appeared inside a wall and died. After respawn the world was completely changed/ruined. It didn't make any sense what I was looking at. I had fractions of my buildings all over the place without any coherence. 

Could you please restore this to the last time I saved the game? I spent several days working on these things, or I would like to ask for a refund of the game.