敲诈

敲诈	qiāo zhà	to rip off / to extort (money) / extortion / blackmail
敲	qiāo	to hit / to strike / to tap / to rap / to knock / to rip sb off / to overcharge
诈	zhà	to cheat / to swindle / to pretend / to feign / to draw sb out / to try to extract information by deceit or bluff