Why would you need to do anything? You are not an employee when you own stock. They do not compensate you for your time to respond to letters. Stock certificates are made to store in a portfolio in a safe. Businesses may choose to invite participation, but most people do not even look at their stock certificates until they need liquidity. In this case the process of "encheating" stock certificates allows a court to relieve you of your property for an arbitrary remunerance, which in this case was less than the original purchase price in equivalent dollars at the time. The company did not file bankruptcy, they just wanted to go back to private ownership and not share in the profits of their success with the people that invested in them.
So the company does something which is legal for them to do, and you blame the company?
Even if whomever it is that ran the company thought it was a fine and just thing to do, you can certainly blame the company for doing something which is at best amoral, and more likely immoral. Not all business has to be immoral, although I don't see many moral businesses. Maybe the world of business doesn't suit people who are not sociopaths.