All complaints involving or concerning the payment of compensation shall be initially filed in writing with the Director of Human Resources. Only complaints which allege that extra-help employees are not being compensated in accordance with the provisions of this Memorandum of Understanding shall be considered as grievances. Any other matters of compensation are to be resolved in the meet and confer process if not detailed in the Memorandum of Understanding which results from such meet and confer process shall be deemed withdrawn until the meet and confer process is next opened for such discussion. No adjustment shall be retroactive for more than sixty (60) calendar days from the date upon which the complaint was filed. No change in this Memorandum of Understanding or interpretations thereof (except interpretations resulting from Adjustment Board or arbitration proceedings hereunder) will be recognized unless agreed to by the County and the Union.