But Labour's ACC spokesman, Andrew Little, said that explanation lacked credibility.
"I have severe doubts that what she said is the case," he said.
In a statement yesterday, Ms Pullar said she recalled only one conversation with Mr Key where she made him aware of her situation and that was before he became leader of the National Party. "I was very distressed at the time and I took the opportunity to vent my frustrations.
"He listened politely, but I did not ask him to do anything and he did not offer to assist."
Mr Key denies being involved in a support team for Ms Pullar.
Sovereign yesterday said it would not release the correspondence that preceded its 2007 letter unless Ms Boag and Ms Pullar gave their consent. Ms Pullar refused to do so.
Ms Pullar is the woman who was mistakenly sent the private information of 6700 other ACC clients in July last year and allegedly tried to use it as leverage to secure benefits.
Police are now investigating.
And the Privacy Commissioner is investigating ACC's privacy policies and matters around the leak of information to the media.
Opposition parties want an independent inquiry into Ms Pullar's use of her political links in pursuit of ACC claims for cycling injuries.