Recently, I met a troublesome [grievance] I worked in the hospital laboratory department, my cousin called to test the blood routine, asked me to go to work half an hour early, he was already waiting in the hospital to draw a blood routine

Recently encountered a troublesome [grievance] I worked in the hospital laboratory department, my cousin called to test the blood routine, told me to go to work half an hour in advance, he has been waiting in the hospital to draw a blood routine, let me help draw first, do not want to queue up again, after the blood draw he said that recently always dizzy let me put the blood lipid liver and kidney function other can do all do, wait for the list to come out weChat sent to him, after saying roll down the sleeve and leave, did not mention to pay, originally said that the blood test routine, it is twenty dollars, now to do a full set of biochemicals, I asked for two or three hundred dollars, and I didn't bother to ask him for it.

In recent months, he has come to check once a month, and after drawing blood, he patted his sleeve and left, the cost was not mentioned at all, it was all paid for by me. He and his aunt earned nearly 20,000 yuan a month, and my salary was more than 4,000 yuan, so how could I ask him to pay?