Something digging into compost bin

[Hatewaybuloo]

Something (I’m guessing a rat) has burrowed a hole into my compost bin. The bin is directly on grass at the bottom of my garden- we don’t put any cooked stuff in it, maybe peelings, gone off fruit/veg, bits of cardboard, egg shells, egg boxes etc.
Does anyone have any tips for keeping the rat out? Also does this mean I can’t use the compost? Was going to use it to grow veg, flowers and around small trees. Do I need to start again? (Really hope not as there’s about a years worth in there and I don’t know what to do with it all!)
Is it better to have a raised bin on bricks or something so nothing can dig underneath?

its not uncommon, even if there's no food to eat the heat they generate makes them tempting places for a nest.
If they have made a nest, you either find some way to kill them off, or destroy their nest by completely empting the bin and repositioning it somewhere away from hedges and with no easy means of access from underneath. Of course that just means they'll set up home somewhere else, nearby.

Put heavy duty chicken wire or wire under the bin.

It’ll be fine to use the compost. Moving it will probably sort it out. Old trick is to bash the outside with a spade every day. They don’t like th3 noise or disturbance and ,Mive out.