If a member's accumulated contributions under a retirement system are refunded, the person ceases to be a member of that system, all the person's service is canceled, and the person relinquishes claim to any benefits payable to members of the retirement system.
Termination Of Membership
Mont. Code Ann. § 19-2-601, under Termination of Membership and Refunds.
Mont. Code Ann. § 19-2-601