How do people afford a knowledgeable lawyer and forensics expert as mentioned in some of the replies? Don't they get expensive fast? What if you lose the case... how much money will you be out?
Secondly, advice about going to lawyer does not mean sue until it hits the supreme court. It means, get professional advice on the likely outcomes of the different actions. Such as what kind of settlements can you expect, are you like to win on procedural grounds etc... How to best proceed etc... and what outcomes are acceptable to you.
This kind of advice will give you an expected ROI on different approaches that are available to you. Upon which you make an "investment" decision on which approach will be the best for you (not always financial). Normally such a conversation won't take to long and will not be billed at the legal firms top rate.
[1]: https://www.generali.ch/en/privatkunden/haftung-recht/rechts... (which is the one I pay for)