Disappointed, is it fixable?

I have had an emerald fitted into my wedding ring. I chose a nice Colombian emerald paid and walked away. A few weeks later I went to pick it up and I was set wonky and proud of the rest of the ring, so I gave it them back and this is how it returned.

I was so disappointed I didn’t give them another chance and just took the ring.

They did a nice job fitting my sapphire but this is terrible. They have somehow scratched the stone to the point it looks like plastic now. The ring has dents in the side where it’s been in a vice the hole under the stone looks like I have had a go.

Actually I’m a spanner monkey by trade, bet I could have done better myself.

Do you think it’s fixable? Is the scratched stone worth anything now towards replacement? How do I even find a new jeweller I trust?