(b) Such service or acceptance of service shall be valid and binding upon the attorney and upon all subscribers exchanging at any time reciprocal or interinsurance contracts through the attorney. Two copies of such process or notice, in addition to the original, shall be furnished the secretary of state, and he shall file one copy, forward one copy to the attorney and return the original with his acceptance of service or for return of service. But no process or notice shall be served on the secretary of state or accepted by him less than ten days before the return day thereof. Where the principal office of the attorney is located in this state, service of process may be had upon all subscribers by serving same upon the attorney at said office. Service of process shall not be had upon said subscribers or any of them in any suit or other proceeding in this state except in the manner provided in this section, and any action, suit, or other proceeding may be begun and prosecuted against or defended by them under the name or designation adopted by them.
(c) The attorney shall pay to the secretary of state an annual fee of twenty dollars.