Cataracts Treatment

So my dog got cataracts and so I spent $3,000 for him to have the surgery.
First off the 3k was for both eyes, it would have only been $1,500 for one eye, but both had the cataracts. THE point is, the doc said…oh well the lense was too thin for the one eye, so we couldnt fix it.
So now my dog can only see out of 1 eye, and runs into walls and things.
Then we go for our “follow up” visits which are $120 dollars for the visit and $130 for 4 bottles of eye drops that he needs.
So every month that is $250 dollars! Come on doc, you are killin me here.
Do I have the right to ask him for a price break or for a $1,500 refund of the one eye since he didnt fix that one? Or what should I do?