It should correct its self over time. The problem is the environment is sealed, and could take a long time.
This is one of those problems of possibly making it worse while trying to make it better.
One idea would be to make a super saturated solution of Sodium thiosulfate, and slowly and carefully add it to the well, give it some time and check the chlorine level with a pool kit. The sodium thoisulfate should have better results then the hydrogen peroxide.
Your problem is, you are not actually removing the chlorine from the well, you are just changing its form.
You might just invest in some water filtration systems for everywhere that uses the water for digestion (kitchen faucets, and possibly your refrigerator for cold water and ice), and give it some times and see if it works its self out on its own (this depends on the local geology).
Or you could spend $1000++ dollars and invest in a well filtration system...