In 1215,king john was forced to sign the magna carta limiting his power. after signing the document, he _ it.

Well he didn't really do anything to it, Pope Innocent III annulled it, leading the First Barons war. (First barons war was a war between England, and rebels, the rebels were supported by France, and Scotland.)

His son, and grandson however kept reissuing the Magna carta to make changes to it, 

I would have to say annulled even though he never actually did it, but the only thing to occur within his reign was the annulling of the document by the pope.

What are the statements?

Not true it depends on the person