A teacher worked some additional hours in administrative tasks but the director recorded them as teaching hours
Question

                I am a teacher and one day I worked in the academic institution where I worked for a few additional hours, doing administrative work, and I did a few other tasks for them. That was because they were short-staffed that day. The director of this institute recorded my additional hours as additional teaching hours so that I would be paid, because they would not pay me as a teacher otherwise. It bothers me that I will not get paid except in the way mentioned above. Is this money permissible for me in the light of what I have mentioned?.
Praise be to Allah.If you did these additional 
    hours because they were short-staffed, and the director recorded them as 
    additional teaching hours, because it is not possible for you to get what 
    you are entitled to except by this means, then it does not seem to us that 
    there is anything wrong with that, because you are entitled to be paid for 
    your work, and what the director did was done for a purpose, which has been 
    achieved in this case. Such things are customary in many institutions; if 
    the directors adhered to the letter of the law, a great deal of work would 
    not get done.  
And Allaah knows best.