The repair shop cheated me by charging a lot for parts I didn't need.

cheated 是动词 cheat 的过去式，cheat 的意思是"欺骗、欺诈"，指通过不诚实的手段获取利益或优势。在句中表示修理店通过收取不必要的零件费用来欺骗顾客。