Hi @Umesh1,
Welcome to the Bunnings Workshop community, it is fantastic to have you with us.
As the framing used on shower screens is often specific to the system, it would not be easy to find an off-the-shelf replacement door. If it were a Bunnings product and you could identify which shower screen it was, we could see if it's possible to order a replacement part, but I would be surprised if you could just order a door.
Realistically, your best option is to contact a glazier who can come out, measure the framing, and have a custom glass panel cut to size, then install it.
You can use a service such as HiPages or True Local to find glaziers who operate near you.
Let me know if you have further questions.
Jacob
