Translate the following sentence into English.
经过三个月的投诉，我终于让百货商场经理退还了多收我的二十块钱。
【正确答案】：
AFTER THREE MONTHS' COMPLAINT, I FINALLY MADE THE DEPARTMENT STORE MANAGER RETURN THE 20 YUAN THEY HAD OVERCHARGED ME.
【题目解析】：
考点：投诉complaint；多收overcharge；多收我的二十块钱，前面的修饰没法用形容词表示，所以用定语从句...the 20 yuan they had overcharged me。