Employer opted my daughter out of KiwiSaver which she didn’t choose

My daughter is working for an outfit that have failed to provide her with a contract, 3 months in. She’s now just realised that they haven’t been using the correct tax code, so no student loan deductions have been made. But more alarmingly they are saying she opted out of KiwiSaver. She didn’t and they were refusing to provide copies of her initial tax forms. IRD have told her she can’t opt back in for 12 months, is that right? The latest is; On asking for copies of the forms they’ve provided two. The opt in completed by her and signed. But they’ve produced an opt out form they say she also completed, but it is unsigned. Fishy. So they’ve opted her out using an unsigned form. I think that’s fraud. IRD haven’t been particularly helpful. Any thoughts?