Deloitte has been sued by a former female employee who alleges a partner at the firm repeatedly slammed a door against her arm during an argument and used mobile phone tracking to stalk her.

Katrina Jones, who joined Deloitte in 2015, said in court documents that she now suffers from mental health problems after the “harassment and bullying” behaviour from Christopher Holliday.

She has alleged Deloitte failed to stop Mr Holliday’s aggressive behaviour towards her and did not properly monitor her mental health. Ms Jones also claimed that Deloitte failed to deal with her complaints properly, and instead conducted a probe that would allow Mr Holliday to retain a senior position. She has sued Deloitte for damages of an unspecified amount.

Court documents revealed that Ms Jones began an “intimate relationship” with Mr Holliday around the end of March 2016. The documents state she was in a vulnerable position.

Ms Jones said in documents that Mr Holliday convinced her to leave her husband.

The claim states: “Throughout their intimate relationship, Mr Holliday was highly controlling and manipulative of the Claimant. This controlling and manipulative behaviour was inextricably linked to Mr Holliday’s seniority and authority over the Claimant whilst working for the Defendant.

“For example, he often boasted that he had unlimited authority over others, including the Claimant’s line management. He often told the Claimant that he could and would dismiss the Claimant, and that he was the only partner at the firm who could fire a member of staff without having to give a reason.”

Ms Jones claimed that Mr Holliday’s behaviour was characterised by “bouts of anger and rage” towards her and that he took advantage of the vulnerable state she was in due to her marriage. She alleged that Mr Holliday forced her to stay out after work and go drinking.

In one incident, Mr Holliday allegedly kicked Ms Jones’ handbag and threw her umbrella across the room while eating in McDonalds. When the pair returned to his flat, he then repeatedly slammed the bathroom door on her arm during an argument, leaving her “badly bruised”, according to court documents.

She also claimed that Mr Holliday had required permission to access her location using the GPS function on her mobile phone to help her when she became lost, but alleged that this was instead used to stalk her.

It is also alleged that Mr Holliday punched Ms Jones on a weekend away in Copenhagen in March 2017.

The document states: “At one point during the weekend the Claimant was sat on the end of the bed in the hotel room and as Mr Holliday walked past she reached out and touched him affectionately on the arm. Without warning, Mr Holliday responded by punching the Claimant in the leg.”

On one occasion, Mr Holliday called Ms Jones while he had a file on her on his desk detailing times she had called in sick, the documents said. He said the file created a “red flag” and that he had to decide whether to take disciplinary action. It is also alleged he threatened Ms Jones with reprisals if she contacted him about personal matters on his work email.

“When Mr Holliday conducted himself in an emotionally manipulative, aggressive or abusive way towards the Claimant, she felt restricted in her ability to deal with this conduct by the fear that he may cause her employment to be terminated,” the documents said.

Ms Jones has said she was not informed when Deloitte’s subsequent investigation of the affair started, how wide-ranging it would be and the outcome of the investigation.

She alleged Deloitte did not protect her from retaliation by Mr Holliday despite her warnings.

Ms Jones was signed off work by her GP in October 2018 due to work-related stress from both the conduct of Mr Holliday and Deloitte’s handling of the affair.

The claim states Ms Jones had a depressive episode and has been diagnosed with post-traumatic stress disorder.

“As a result of these conditions, the Claimant experiences anxiety and agitation as well as fatigue, exhaustion, anhedonia and anergia. She lacks motivation and drive and has developed hypervigilance which has led to her withdrawing from society,” the report states.

A spokesman for Deloitte said: “As this relates to ongoing legal proceedings it wouldn’t be appropriate to comment.”

Mr Holliday and Ms Jones could not be reached for comment.