店員:「ご注文がお決まりになりましたら、お呼び___」
Q. Which ending politely asks the customer to call a member of staff?
Translation
"Please call a member of staff once you've decided what to order."
Explanation
お + masu-stem + ください is the honorific request: お呼びください. お呼びしてください mixes humble お〜する into a request to the customer, a common keigo error.