The worst ever

we have been trying to sort out share certificates that we discovered after my parents passed away. all the certificates are in the name of my wife. Since the 5th May 2024 we have been calling them , speaking to numerous people in the company, filling in forms running up and down to get documents certified, making payments and still nothing - take note that it is the 19th July 2024. Every time you query it is a new person and they expect you to resend all the documents. Endless promises of "within 3 days" The shares are worth nothing and by the time we get paid out it will be small change considering the time, effort and costs to settle the matter.