Your English is perfectly understandable.
Glad to hear that the problem is fixed, but i would have the camera checked sometime soon anyway, since unless something is misadjusted, the mirror should not rub anything.
And even if it was dirt stuck between mirror and wall that caused the rubbing, i.e. the mirror itself did not make contact with the wall, it could be that it now is out of aligment.
But try it first. If you don't notice any problem with focus, it's not something that needs immediate attention. But i would have it checked sometime soon anyway.