In case of the amendment or repeal of this part, the liability of fund B shall be limited in the case of a member or person claiming through such member to the contributions made by such member, without interest, and in the case of a municipality to contributions made by such municipality, subject to the deductions provided in the case of withdrawal by a municipality in accordance with § 7-444. All future retirement allowances vested by the retirement of members prior to such repeal or amendment shall be paid in full in accordance with the terms of this part and the rights of the Retirement Commission to compel the payment by any municipality of the sum or sums necessary to provide such retirement allowances granted to members formerly employed by such municipality shall not be affected by such repeal or amendment.