At my last job my performance was complimented a lot, both by my boss and colleagues. I completed all tasks given to me successfully and in time and had some objective successes above what could be expected. At the same time I was bullied by my boss since almost the beginning (I know the reasons, but don't want to describe them here and no, I didn't do anything wrong). Then I was let go during my probationary period. Now I've received my work certificate and the "secret language" (I'm in Germany) shows a very bad grade (something between 3 and 4).
I'm wondering what the best ways to deal with that are. A lawyer would probably cost me a lot.
I know I could contact the employer directly and ask for corrections, but my whole cooperation with this company can be summarised in one sentence: "My boss was a jerk and the company culture dysfunctional". So it probably won't work. It also cost me a bit of time to (start) forget(ing) all the awful behavior I experienced there, with my shrink using terms like "sadism" and "narcissism" to describe my boss, so I wouldn't like to prolong the experience too much.
On the other hand, the current certificate is simply not fair and I wouldn't like it to reduce my chances to get interesting jobs in the future.