same happened to me few months ago , they said cancel it and after you cancel they were making excuses like we have already send the amount and we are very pious persons .

this trader who appeared by the name of crypto king is a fraud. paid him 15000 for USDT but he didn't transfer me any. then he asked me to cancel the deal so that he could return my money. he returned only 2500 and has stopped responding to texts and calls.