Yahoo account hacked?

someone has hacked my account on a number of occasions and i change th password and they do it again earlier to day i changed it and they changed it right after me we got into some sort of war over it and they wont stop. the take my myspace my myyearbook me youtube and every thing but they never do anything with it... show more someone has hacked my account on a number of occasions and i change th password and they do it again earlier to day i changed it and they changed it right after me we got into some sort of war over it and they wont stop. the take my myspace my myyearbook me youtube and every thing but they never do anything with it all they do is change the password. i was talking with my friend about it and now she has been hacked too im not sure if it is the same person but she was the last person i sent a message to and all my sent messages are deleted what should i do because wen i change the secutity questions they change them back