Is it permissible for me to be paid for overtime hours in administrative work and other services, which were recorded as teaching hours for disbursement, knowing that they were not?

If you worked overtime due to a shortage of workers, and the manager recorded it as extra teaching hours so he could pay you, there is no harm in that. You deserve payment for your work, and the manager's action is tied to the benefit realized here. Such practices are customary in many institutions.