When it shall be reported to the State Department of Human Resources or it shall come to their knowledge that any person whose name is on the pension roll is not entitled to a pension or through fraud or misrepresentation has been placed on the pension roll, and has been receiving a pension from the state, the State Department of Human Resources shall make inquiry into such charges and if they are satisfied as to the probable correctness thereof, reference of the same shall be made to the county department of human resources of the county where the pensioner resides, which shall make full investigation and report the result thereof to the State Department of Human Resources. If the charges are established, the name of such pensioner shall be stricken from the pension roll and the State Department of Human Resources shall ascertain and make demand upon the pensioner to immediately refund the same. The State Department of Human Resources shall report such fact to the Attorney General for collection.