First, determine whether the hair is your own. If it is, cut it off and put it aside to continue. If not, tell the waiter. If you are more reasonable than him (her), you can choose to change dishes and get a refund. If he (she) cares more than you, it's up to you whether to continue eating or check out! !
Second, if you come from the hotel:
First of all, make sure that the hair is the guest's. If it is, tell it politely, cut it off and put it aside, and ask the guest to continue. If not, argue with the guest immediately and emphasize that the hair belongs to the guest. If there is no him (her), the guest can choose to change dishes and get a refund. If he or she doesn't care as much as you do, the guest can choose to continue eating or check out! !
:-)