总经理助理&客服经理(兼) = Assistant to GM -cum- Customer Service Manager
总经理助理=Assistant to GM/ General manager
客服经理=Customer [单数] Service [单数] Manager
(兼) = cum拉丁;英文<介系词>=Together with; plus. 例句: our attic-cum-studio
总经理助理兼客服经理
Assistant Manager / Customer Service Director