I've been attacked by some hired mercenaries, that wanted to kill me, after dealing with them i took their contract and there was wrote that i roobed his outpost and i'm the worst thieft ever è.é but i never took anything from that one! it's a bug?

One has to wonder how someone got his message.

Did you steal anything else from Septimus Signus? Sometimes NPCs will send hired thugs after someone for just moving stuff around.

STOP RIGHT THERE, criminal scum. Pay a fine or its of to jail for you! Sorry I thought I was playing Oblivion just for a second there.