Hi @Ivon,
A warm welcome to the Bunnings Workshop community, it is fantastic to have you with us.
It would be very difficult to give you advice without seeing the issue.
Can I ask you to upload some photos of the holes in your floor?
Let me know if you have any issues, I am happy to help you upload photos if required.
It could be a simple case of using a filler product, or it might involve back blocking the holes and attaching some plywood or fibre cement sheeting. It all depends on the circumstances.
I will assist further when I can see what we are dealing with.
Jacob
