It is not "illegal" for her to say that.....................

As you were uninjured, you have no grounds for a lawsuit.

This is a Q&A forum. You have not asked a question.

This is a customer service issue, not a legal issue. You have no grounds for a lawsuit. None.

We can't answer why someone else did something. You have to ask them.

These are great questions for your lawyer. There are numerous variables.

You ask what you can do. That depends on what you want to do. Start with contacting the child support office. You need to establish paternity.

They are both at very serious risk of trouble. Don't ignore this. You need to hire an attorney for her today.

You need to ask a solicitor in the UK................

She has an attorney. That is who she should ask.......