The woman at the centre of a sex scandal that has engulfed Seven West Media has ramped up her crusade against the media company and its executives.

Amber Harrison, who opened a Twitter account earlier this week to release potentially damaging information about the company, on Friday posted more private company communications on the platform.

These included emails between Seven executives and her former boss and lover, Tim Worner, and emails relating to a police raid on Seven’s offices three years ago.

Ms Harrison said earlier this week she had been “driven to Twitter” by the media company’s lawyers after chief executive Mr Worner was cleared of misconduct in an inquiry sparked by Ms Harrison’s explosive allegations of illicit drug use, unauthorised credit card spending and vindictive behaviour by her former boss.

Labelling the inquiry finding a joke and a “whitewash”, Ms Harrison took to Twitter to seek redress.

“Channel Seven demands my silence under legalities of two contracts they won’t honour so instead I’ve joined twitter to chat to (Seven West Media board member) Jeff Kennett,” she wrote on her Twitter profile.

In her latest attack, Ms Harrison posted screenshots of emails sent between Seven executives before and during a controversial Australian Federal Police raid on Seven’s Sydney offices over alleged deals with the Corby family.

In the posts, Ms Harrison wrote: “Is my case the first cover up Seven West Media has been involved in?”

The email from Seven producer Mark Llewellyn reads: “We got Mercedes [Corby] signature late last night. So very close.”

It was in response to an email from Mr Worner which read: “It is in the bag. No? I am operating on that!!?”

While the email does not confirm what the signature was for, it was sent on February 8, 2014, two days before Schapelle Corby left jail in Bali.

Ms Harrison’s posts about the AFP are linked to raids carried out in 2014, in which the police sought to determine if Seven and the Corby family broke Australian laws under the Proceeds of Crime Act.

The former Seven staffer earlier aired claims, denied by those involved, that Mr Worner had affairs with other current and former staff members.

In a series of posts earlier this week, Ms Harrison alleged she was “bullied” and “harassed” and criticised the company’s investigation into the scandal.

The former Seven executive assistant posted pictures of documents she claimed were ignored by the investigation, including taxi receipts she alleges Mr Worner used to “arrive and leave my house” that were “expensed on [a] corporate card”.

“The purpose of joining Twitter is to talk directly to Seven West Media board member Jeff Kennett and present the evidence,” Ms Harrison told The New Daily.

Seven and [law firm] Allens have all this evidence I am posting – and Seven have had it since March 2015.”

Mr Kennett, director of Seven West Media, told The Australian at the weekend he was “profoundly disappointed” Ms Harrison was continuing to “defame some of Channel Seven’s employees”.

Ms Harrison was made redundant in November 2014, but claims she was forced out of the company over an investigation into spending on her corporate credit card.

She has also filed complaints to the Australian Stock Exchange and Australian Securities and Investments Commission, claiming Seven West Media had released “a factually incorrect statement to market” and “trading on this incorrect information”.

Mr Kennett told The Australian he was confident in the results of the investigation that cleared Mr Worner of any wrongdoing.

“The board has spent an inordinate amount of time trying to prove up the allegations made in Ms Harrison’s statement in December, and further comments she has made since,” he said.

“We have had endless meetings and employed independent forensic investigators at great cost to the shareholders, and the board stands strongly behind the statement that we put out to the ASX.”

Seven said the investigation found Mr Worner was not responsible for identifying credit card misuse by Ms Harrison, nor in the payment of a bonus to her, and there were “no irregularities in Mr Worner’s corporate credit card use”.

“The lesson for women is don’t work for Seven West Media and expect to be treated equally or with respect,” she said in a statement.