One of my visitor click on my ads 25 times [on my link ads]. I've two link ads unit. what should I do now? [although google paid me for every click]. I'm really confused what should I do now? [Click not came from my country]
If it isn't fraud and it is from an IP that you can not control, what can you do? Obviously yours is not an isolated case. Google knows how to handle this. If you are worried you can write your account rep.
Just to be safe and to let Google know you are on the up & up I would contact them and let them know what happened.