It’s not what you think is right, it’s what the landlord considers right.
You are correct in saying that the stovetop has a depreciated value. That’s what you would be expected to pay if you took it to NCAT.. You need to do your research. How much is a new stove top that’s equivalent (not some cheap brand). How old is it? Calculate the depreciated value. Put that to the landlord and see what he says.
If the landlord does not agree, at the end of your lease you can dispute this through NCAT.
Don’t buy a new stove top because it’s unlikely you will get your money back unless the landlord agrees to some payment.
Unfortunately you have damaged the stove top and are liable to reinstate it to the previous condition.