Unbelievable what happened to me as an intern

I got an internship in an office, unfortunately I didn't reckon with this lousy head of department who thinks he can take everything for himself, he's probably known for being a nasty bloke! I must have made a pair of minor mistakes when working with Word, but maybe he did it himself to accuse me of making a mistake, I've only been doing this for a short time, I don't know, but I didn't expect so much malice.