653-8  Effect of service.  (a)  In case of service upon the garnishee, the serving officer’s certificate of service or, if by mail, a copy of the return receipt shall be prima facie proof of the service.

     (b)  For purposes of this chapter, service is effective from the time when the copy is handed to, or left in the office of the garnishee, or reaches the garnishee or the garnishee’s office by mail.