(b) shall, for the purpose of computing an
allowance or other benefit under Part I or II, be deemed not to have elected to contribute the amount of the contributions in respect of which the revocation applies, and, if the
allowance or other benefit has been calculated, it shall be recalculated accordingly and, if it has been paid to the person based on the contributions in respect of which the revocation applies, an amount equal to the difference between that benefit and the recalculated benefit may be recovered from that person, in the prescribed manner, from any
allowance ...[+++] or other benefit payable under this Act to that person, without prejudice to any other recourse available to Her Majesty with respect to the recovery thereof; and