how much is overstay penalty per day for estonian? he is trying to leave china but not alowed

My boyfriend estonian nationality went to china on holiday and had some kind of visa for one week. In airport pudong he suposed to fly friday night but they didnt let him fly..not sure for what reason probably visa. last money he spent for traing to airport. during weekend he was just waiting when i sent him some money as he couldnt do anything. I dont know how much everything cost so i sent 120usd. Now i am afraid it wasnt enough for new visa and penalty...i would be gratefull for any information what to do now where to go and how much money he accually need. thank you katerina zobacova