Hi @zurc,
Welcome to the Bunnings Workshop community, it is wonderful to have you with us.
Unfortunately, we do not sell this style of vertical blind, and consequently, we do not have any replacement parts for this style of vertical blind.
If you were unable to find a replacement, then perhaps you could put a long staple on either side of the damaged hook, and then wrap it with some wire to reinforce it. It isn't a perfect solution, but as long as the staples get good purchase into the plastic or the top of the blind, then it should hold.
Let me know what you think.
Jacob
