(a) Whenever any person has any claim or demand upon any telegraph company having offices or more than one place of doing business in this state, such person may institute an action against such telegraph company within the county where the principal office of such company is located, or in any county where such telegraph company may have an agency or place of business, or where such place of business was located at the time the cause of action accrued or the contract was made out of which the cause of action arose.

(b) In all actions brought under this Code section, service shall be effected upon such telegraph company by leaving a copy of the summons and complaint with the agent of the company, if any; if there is no such agent in the county, then a copy of the summons and complaint shall be left at the agency or place of doing business where the same was located at the time such cause of action accrued or the contract was made out of which the cause of action arose.