Here is what you can do in this case. You can sue the company you think is responsible for this. Some people have done this in past like you can read in this article:

https://timesofindia.indiatimes.com/gadgets-news/lastpass-data-breach-someone-sued-password-manager-after-losing-bitcoin/articleshow/96769155.cms

Chances of getting the funds back or getting paid the compensation is very less but still you can take this route if you want.

This is not the first time such a case is happening. If you check online forums, you can find many other such similar cases like this one:

https://twitter.com/RMessitt/status/1723141037856596175?s=20

May be you can connect with such people and ask for what actions they took.