If at any time the Agency, after giving him (if then living) an opportunity of being heard, are satisfied that a claimant, in whose favour resettlement compensation is being or has been paid or an award of long term compensation has been made, has failed to comply with the requirements of Regulation 7 (a), or that a material statement, made by or on behalf of such a claimant in connection with his claim to compensation under these Regulations or any review of an award of long term compensation in his favour, or in any particulars supplied under Regulation 7 (a), was false, the Agency may reduce or discontinue the compensation to the extent to which it exceeds the amount which would have been paid or awarded had the said requirements been complied with or the material facts been truly stated, as the case may be, and the amount of any excess found to have been previously paid shall be recoverable from the claimant or his estate, or from any other person who has received it, as a debt due to the Agency and may be deducted from future payments (if any) of compensation remaining to be made.